Girls' panties (wedgie from undies = uncomfortable)
Bras (yyyeah... no. of the three bras I own, two are covered in lace and ribbons and stuff so it feels like drag rather than actual clothes, and the other's a sports bra I've had for years)
Girls' clothing that shows off skin/is visibly "girly" (should be self explanatory)
Anything pink, unless it's worn as a joke (a comeback to people saying "God, I can't even imagine you in pink...").
Chinos (nooo, so ugly, so boring, reminds me of people I'd rather not think of)
Trainers, unless I'm excercising and need them because of that.
Clothes with visible brand names on them (I don't like being a living billboard).
Clothes made from itchy/uncomfortable material, such as wool sweaters, linen stuff, etc.