Pocket Tees. Invaluable when working outdoors (or indoors) (or sansdoors) (or o'dors). Forget the doors. Invaluable.
Also, tho your demographics probably tend toward one gender more than your other, only the first design is something your average guy (read me) might wear. (Yes, I realized that many of you men reading this might wear others and take umbrage - which is why I used the modifier "average". I think it's a fair point, mostly, even if not entirely.)
Also maybe some long-sleeved tees? That sun on aging skin...
Just some suggestions. Neat stuff overall.