I prefer looser fitting shirts and T's. I just find tight fitting clothes a bit uncomfortable. What I do like is a shorter fitting T-shirt that leaves my belly hang exposed.
Loose but just tight enough to cling to the belly so it buldges but hangs off of it so you don't get a real sense of how big it actually is. It also depends on the type of fabric.
When outside, loose or long hanging (if tight shirts) as I wear jogger/fleece pants at my waist (covered along with its waistbands are softer and more comfortable than the belts for my jeans (normally worn under my belly)).
