Some guys end up w/ sorority date party/house party t-shirts here, as they were the dates and that's part of the deal; i'd guess that only the chapters that don't worry about 'party shirts' do that though - i've never run into a non-brother wearing letters, though i'm sure it'd be weird . . .
As far as little brothers/big brothers, a few of the sororities here have honorary 'big brother' status, whereby the guy sort of looks after the pledge/new member, takes her around and introduces her to people to make her feel more integrated into the greek system, in addition to what the big sis etc would do. it's pretty cool; i'm doing it for a girl this semester as a favor to a friend (her big sis), and it's really cool to see her hanging out with some of the guys and girls i've introduced her to, and to see her having fun in those sometimes-awkward 'all-greek' situations. we don't do sister organizations (james covered that earlier), but this works out for some sororities in terms of the social scene like that.
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