I've got one top in particular that chafes reliably, and others that are like silk. I can't tell you what the distinction to look for in store might have been, but there is a definite improvement with price.
i'll just give them thorough test rub in-store. i'm sure it won't be the first time they've seen that
better than AK-47 burns on the nipples?
i would take that over standard nipple chafing any day of the week. hurts more, sure, but more Tough Guy points. Bonus points for obscurity and rarity too. That stuff's gold at the injury-hipster olympics