In summer I just about live in strapless bras, as in our hot Australian climate so much of what I wear has necklines that demand it, like spaghetti straps and cut out shoulders.
I am very small busted (I barely wear an A cup) and rely on bras as much for their padding as their other functions! Because strapless bras don't cover as much territory, there is less padding, so I feel even smaller. I'm not small over all, with fairly strong shoulders, a not-tiny ribcage, and lots of bottom and thigh er... "muscles" so I like to add something to feel proportional.
Any hints out there?