Every simple thing can be made complex. Take t-shirts for example. A cursory look at CustomInk.com reveals a lot of options.
The most basic distinction is between unisex jerseys and girly jerseys. According to Lara:
the standards are like your regular guy tshirt right
and even the small sizes are kinda big for girls
plus girls like to wear shirts that are a little tighter fitting
Fair enough. Now what about sleeve lengths? Besides the short sleeve and the long sleeve, there are raglans with 3/4 sleeves, also called baseball sleeves.
The most subtle differences are the materials. Tees can be 100% cotton. Cotton can have weights commonly ranging from 4.3 oz (lightweight common for American Apparel) to 6.1 oz (heavyweight, beefy). Furthermore, cotton can be preshrunken, combed, and ringspun. That particular combination is just tee talk for the best kind.
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Blank tees are surprisingly inexpensive. Entry-level brands can be had for two to three dollars. At the higher end, getting a custom-printed American Apparel tee is no more expensive than buying a comparable stock tee retail.
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Thin, asian girls can only wear size small, even if they are really a little taller. A corrolory is that every Asian girl at the law school wears the same size.