You don't want your workout clothes to sabotage your workout. That's why you should follow this advice from Teen Vogue and avoid wearing these items to the gym:
1 100 PERCENT COTTON T-SHIRTS
You should wear breathable fabric whenever you work out. If you wear cotton t-shirts, then it's going to collect the moisture and make you feel cold and clammy.
2 PULLOVER SPORTS BRAS
You should invest in a sports bra that has a clasp in the back. That way, you can tighten it to the right fit. If it's a pullover bra, then you're going to end up loosening it eventually and then it won't support your breasts the way it needs to.
3 FANCY PANTIES
You shouldn't be wearing lace or silk underwear while you workout. You need to walk around in breathable fabrics, which means you should be wearing cotton bikinis.
You don't need to look perfect at the gym. Your makeup will end up getting messed up, and it could even clog your pores and cause breakouts. That's not any fun, which is why it's best to go makeup free.