I found 'crop top' styles very comfortable - resembling the top part of a swim suit, all stretch and no hooks. I sympathise if you find it awkward actually getting a top on,especially with a scar area to contend with. Maybe you and your sewing machine could adapt an old swimsuit (with cups) and use velcro sparingly!
The 'secret support' t shirts do their job for the less endowed but I fould myself unimpressed with the appearance.
Sports bras have little or no flexibility and are for 'restraint' not comfort!
Good Luck -
H.