This is why I wish we'd go back to the boring red & khaki dress code. There are plenty of TMs who really stretch it (and our STL does too) and guests can't tell who works there and who doesn't. Shirts with some red are ok, as are shirts that are really more orange, purple, brown, pink, peach - any shade on that side of the color wheel seems to be allowed. Shirts with non-Target logos are ok. Hats (not just at Food Ave, sometimes worn backwards) and hoodies with hoods up.
I'm not sure there's anything that's not ok. No one's tried short shorts or bare midriff yet....