Assuming you don't mean t-shirts... but a majority of big leaguers use a Tanner Tee and you can get em for about 60 on tannertees.com
Easily the best tees to hit on.
Hope this is what you're looking for.
Saw this on Twitter with my phone, zoomed in on it and its not his usual Rawlings. The logo and script on the thumb look like Marucci, which has me confused.
Thoughts??