Most Helpful Girl
Yeah...T's are a no, unless it's a V-neck and paired with a nice cardigan or sweater. V-necks give the illusion of a longer neck, and can give you the appearance of a slimmer upper-body. (Same tip works for women as well.) Anyway, here is a section from AskMen explaining some fashion tips for big guys. link
Some other tips:
-Avoid shirts with breast pockets; they give the illusion of a big chest...If you do own a shirt like that, then again, pair it with a sweater or jacket.
-Fit is everything ! Make sure your clothes are loose, yet not too loose (or too tight !) If there aren't any big and tall stores in your area, then shopping online is the next best thing(:
Ex. link (yes, I know the models aren't plus-sized, but their clothes represent what I'm talking about.)
Overall, find a style that suits your personality and anything you're comfortable in. Good luck !