The description for these shirts does not mention that they are slim fitting. There is a “Slim Fit” tag sewn into the shirt I bought.
Talked to the buyer. She confirmed that the tag says slim fit; we weren’t given this by the vendor. It’s now added to the sale.
HOWEVER, it’s Nautica’s version of slim which isn’t that slim. She said they fit pretty true to size for her sons and the size chart matched the shirts she got.
TL;DR: Be sure to look at that size chart and compare it to a shirt you like.