with reference to the preferred embodiment of the invention as shown in fig1 hat 10 includes a &# 34 ; square crown &# 34 ; 11 made of fabric and a bill or brim 12 , although it should be noted that the invention is not limited to a particular crown or bill shape or material and in fact works with any number of crown and bill shapes , conventional materials and relative rigidity , including very flexible or &# 34 ; floppy &# 34 ; crowns and brims . referring to fig2 inside the crown 11 is a headband 13 that circumscribes at least a substantial portion and preferably the entire interior circumference of the crown 11 . headband 13 may take the form of any conventional headband material such as leather or fabric or may be a full or partial interior lining for the crown 11 . headband 13 is attached to the crown 11 along its circumference at least at seam line 14 by stitching , permanent adhesive or the like , as is well known in the art , that is spaced from the lower edge of the crown 11 and the headband 13 so that an accessible space is created between the crown 11 and the headband 13 and by which the lower edge of crown 11 forms a loose flap 15 under which is positioned the sliding mechanism according to my invention . the lower edges of both the crown 11 and the headband 13 preferably are hemmed to improve appearance and to eliminate unravelling of the fabrics . as shown in fig2 and 3 , the bill 12 is attached to crown 11 by a sliding track mechanism having female and male interlocking parts which are a u - channel 16 and t - channel 17 , respectively . both channels are preferably made of a flexible semi - rigid material such an extruded polyvinyl chloride , or pvc , as will be described . u - channel 16 is adhesively fixed to the headband 13 by any well known adhesive that will permanently bond pvc to a fabric , as shown within the space formed between the flap 15 of crown 11 and the headband 13 such that it circumscribes at least a substantial portion or , preferably as shown by fig4 the entire circumference of the outward - facing surface of the headband 13 and with its open side 18 facing outwardly toward the inward - facing surface 20 of the crown 11 . the open side 18 of u - channel 16 includes a pair of inwardly extending spring - like lips 22 of thinner cross section which retain the cross portion 24 of t - channel 17 and enable the t - channel 17 to slide along at least a portion of the length of the u - channel 16 . for a firm construction , the inner edge portion 26 of the bill 12 preferably is permanently affixed to and covering the leg portion 28 of t - channel 17 from both sides by an adhesive or stitching , but it may also be attached by hook - and - loop fasteners such as velcro ® if it is desired to permit separation of the bill 12 from the t - channel 17 . however , such removable attachments may as with the prior art not enable a secure and uniformly clean appearance when used . referring to fig5 and 6 , the spaces and dimensions have been exaggerated for clarity . u - channel 16 and t - channel 17 , although both made of a flexible , semirigid pvc so as to be extrudable in longer lengths and bendable into various circular shapes , preferably are of differing densities , with the u - channel 16 of a lower density so that the lips 22 can be resiliently bent inwardly and outwardly as the t - section 24 of the t - channel is inserted and removed , but spring back into retaining position after attachment and detachment of the bill or brim 12 . the inner side 25 of t - section 24 is chamfered to facilitate insertion . t - channel 17 preferably includes a collar 27 to ensure smooth gliding against lips 22 . as is now evident , when the bill or brim 12 is attached to the crown 11 by insertion of the t - section 24 of the t - channel 17 into the u - channel 16 and slidingly held by the lips 22 of the u - channel 16 , the bill or brim 12 may easily be rotated around the circumference of the crown 11 to any desired position and without removing the hat 10 from the wearer . when so attached , the bill 12 may be moved around the circumference of the crown 11 by the sliding of the t - channel 17 within and along the u - channel 16 . when the headwear is properly assembled , the lower flap 15 of the crown 11 covers the t - channel 17 and the u - channel 16 so that they do not detract from the appearance of the headwear 10 . because the track mechanism 16 , 17 is sandwiched between the lining or headband 13 and the fabric or crown 11 , there is a smooth continuous gliding motion , and the mechanism never touches the head of the wearer . although in the preferred embodiment t - channel 17 is affixed to bill 12 and u - channel 16 is affixed to crown 11 , it also is possible for the t - channel 17 to be affixed to the crown 11 and the u - channel 16 to be affixed to the bill 12 . similarly , if hook and loop attachment means are used , bill 12 can be detached reattached by the disengagement and re - engagement to the t - channel 17 without detaching the t - channel 17 from the u - channel 16 . a further advantage of my invention is illustrated as generally shown in fig7 in which the top portion 30 of crown 11 can be removed or rotated relative to the bottom portion 32 of crown 11 by a similar sliding mechanism 34 in which the bottom edge 35 of the top portion 30 is adhesively fixed to another t - channel 36 extending the full circumference and the corresponding u - channel 37 also the full circumference adhesively fixed to the inside surface of the bottom portion 32 sufficiently below the uppermost edge 38 of the bottom portion 32 to enable the upper edge 38 to cover the u - channel 37 when the top portion 30 is removed . in this case , however , the t - channel leg extension corresponding to extension 28 of t - channel 17 has been removed and the fabric of top portion 30 adhesively fixed to collar 39 . an alternative preferred embodiment of the invention is shown in fig8 and 9 to illustrate generally that my invention also works well with a full brimmed hat 40 in which the crown 41 can be worn with or without the brim 42 . brim 42 is attached to a t - channel in the same manner as brim 12 of the first embodiment , except that the t - channel 43 extends the full circumference of the hat along with brim 42 . brim 42 can be differently designed along its periphery so as to present different fashion statements as it is rotated , or different colored sections to indicate a particular position in a game . alternatively , brim 42 may comprise differing structural components along its periphery , as for example a solid portion to act as an eye shade and a tinted translucent plastic to permit filtered light to pass through , or a full face - length screen mesh over a substantial part of the circumference of the brim 42 to selectively cover the face from insects and the like . otherwise , the structural portions of this second embodiment are formed in the same manner as in the first embodiment . although not shown in the drawings , a headband on the interior of crown 41 may take the form of a conventional headband or may be a full or partial lining for crown 41 . as with the first embodiment , the headband is attached to the crown 41 by stitching that is spaced from the lower edge of crown 41 and the headband so that an accessible space is created between crown 41 and the headband to receive the sliding mechanism . a third and further unique preferred embodiment of my invention is shown in fig1 and 11 . as shown in fig1 , headwear 50 comprises crown 51 and two bills 52 and 53 . crown 51 comprises upper crown 54 and lower crown 55 . upper crown 54 is formed in the same manner as the complete crown portion of a regular hat having a hemmed lower edge 56 . the lower crown 55 approximates a truncated cone , in which the outside diameter of its upper edge 58 is equals the inside diameter of the lower edge 56 to which it is sewn as shown at seam line 59 along their respective circumferences . the crown shapes , however , will be governed by the hat styles . as shown in fig1 , a headband or lining 62 is sewn at seam 63 inside the lower crown 55 in the same manner as in the first embodiment and in which the u - channel 64 is adhesively fixed . the upper edge 58 of lower crown 55 in turn is sewn at seam 59 and acts as the liner for the upper crown 54 and to which a second u - channel 66 is adhesively fixed . each of the u - channels 64 and 66 receive the corresponding removable t - channels 68 and 70 of the two bills 53 and 52 , respectively . the two crown portions 54 , 55 and their respective bills 52 , 53 can be of the same or different designs and can provide a substantial opportunity for creativity . although in a preferred embodiment the upper crown 52 and the lower crown 53 together form a dome - shaped crown , it is understood that the crown can take any firm or floppy shape . for fashion millinery , headband 62 preferably is a full or partial lining of the crown at least to cover the inside seams connecting the upper and lower crown portions 54 , 55 . similarly , the bills 52 , 53 can be rotated along and / or removed from crown 51 to present very different appearances of the headwear . although our invention is described by reference to specific preferred embodiments , it is clear that variants can be made and other materials used without departing from the spirit of the invention as described and claimed .
a unique fashion or sports hat or cap assemblage having a brim or bill / visor , distinctly designed with the capability to rotate the brim or bill / visor up to 360 degrees without detachment , and including interchangeable and multiple options for the crown , body and visor portions .