text: i would like to know how to do alterations on a blouse to make it smaller.? i like longer style blouses/shirts but only find what i like in larger sizes. i would like to know how to do alterations to make a larger blouse/shirt fit to my shoulders. take a shirt your size, lay it on the shirt you wish to alter, and trace the outline about 1/4 of an inch around  the smaller shirt(both front and back sides), pin the larger shirt by matching the lines together, and try it on to see if it fits like you want it to, sew using the line you traced and the line on the sewing machine guide.