This bra is soft and comfortable and probably adds a full size to your bust. I have two of them and really like them. The material is super smooth and soft and the whole thing is just so comfy. You could definitely wear it under a t-shirt with no problem. If you don't like a ton of padding, this isn't for you because there's a hefty amount in here. I love Calvin Klein for comfortable bras. I have the matching panties for these too, though I find the panties run a tad bit big (or perhaps are just more "woman" sized).