You will find that unisex adult sizing like this is a win for matching outfits.
Hirtenberger Defence Systems Austria T-Shirt – Multiple Colors
You will find the crew neck sits close without choking, which is a big plus.
Weyland Yutani Shirt From Alien Brand New Multiple Sizes and Colors
This T-shirt comes in various sizes, so you can choose your comfort.
AK-104 Avtomat Kalashnikov T-Shirt – AK47 – Multiple Colors Available
A nice touch is the black button detail on the pocket.
Active Dry Fit Red Adidas trefoil t shirt, Multiple Sizes, With Logo
A nice touch is the solid colorway, which stays true wash after wash.