Brown Ant
Hunter-Gatherer
Number one, I already made it clear I no longer go to the gym for the reason that men stare and oogle.
Number two, have you ever done a HIIT workout? T-shirts ain't gon cut it. Sports bras or tanks are best for mobility and from keeping your body from overheating.
I'm not sure what you refer to as a "HIIT" workout. However, I do run 4-6 miles three times a week IN a t-shirt / loose shorts (not too baggy but not tight). And there is no over-heating so I don't know what you mean by that.