Q:

For a man, does any four-cornered garment require tzitzit?

As far as hilchot tzitzit are concerned, are there many instances where a Jewish man would be required to affix tzitzit to a garment other than a tallit katan or gadol? A few "for-instances" would include a scarf, (for one who would wear one) a four-cornered head wrap to serve as a head-covering, etc. Also, I remembered reading something like this in Kitzur Shulchan Aruch, but at what point does a blanket become a garment? If one were to wrap himself in a blanket and walk around the house (to keep warm, for instance), would the blanket at some point require tzitzit?
In the normal course of events, one hardly ever sees a garment which isn't a tallit affixed with tzitzit, so I'm wondering how far the obligation extends. 

A:

According to here:
A blanket does not need tzitzit.
Some say it is because a blanket is a reserved for night use, and the Halacha is that a garment which is meant for use at night is not obligated to have Tzitzit, even if worn during the day.
According to that it would appear that if you had a blanket that you only used during the day, it would require tzitzit.
Others say it has to be worn as a garment in order to be obligated in tzitzit.

A:

I was told by a rabbi at Ohr Somayach that a "garment", as far as tzitzit is concerned, has to be worn on the body and covering at least the shoulders, so scarves and bandanas don't apply.

