Crewmembers of the USS Discovery have a rather distinctive physical training / casual uniform, with the ship nickname “DISCO” emblazoned across the chest.
The shirts first pop up in “Lethe” and they reoccur a few times including on the joggers in “Magic to Make the Sanest Man Go Mad” later in the season.
A replica of this casual shirt is now available through Amazon Prime. One was previously listed at the StarTrek.com shop, but I don’t see it there any more - the preview image for that one showed a silly “TM” above the DISCO, but the image for the Amazon shirt does not show this, and the size of the text seems more screen accurate… though being unisex the fit may not be the best. I have one on order and will report back on how it turns out
As part of their training uniform, the crewmembers also wear Nike Sock Dart KJCRD shoes in navy blue/white (with the logos covered):
Last fall, Trekmovie did a nice write-up on the shoes, the original shirt, and other “found” costume items, here: