In reply to TheDrunkenBakers:
I've got a Nike top I've been using for years with no problems, but on a recent hill run, it got thoroughly drenched in sweat. The nipple chafe started at about the half way point, and the salty sweat really didn't help.
it would probably have been fine if I'd had a tight shirt on, but with my body shape, that would be doing nobody any favours.
Plasters for next weeks triathlon I think...