I used "Easy T-Shirt and Pant", a DGRequiem sewing pattern available via Etsy.
I used scraps of fabric I already had on hand, and thread from my stash as well.
The 3 pairs of pants and six shirts (one outfit is not shown, but is identical to the one below) were quite fun to sew except for one thing ---
--- or maybe that should be 21 things! Sewing 21 tiny snaps on was a bit of a drag.