I know from my wife (who is a gym rat) how difficult it can be to buy sports bras that fit. I’m not afraid of asking her size, but even if the size is correct, the style of bra you prefer or is necessary is something I leave up to my sister.
I really love the idea of gloves that was mentioned by many and did not immediately pop into my mind. It’s such an obvious one, which does not break the bank and you can’t have enough of. She intends to commute to office by bike every now and then, too, so gloves could really help here, too.