I must admit I do love the sight of a pair of large, full tits stretching a bikini top, esp if the top is on the small side.
But a slim, lithe girl with cute, pert little tits like yours Cathy is simply divine - it's all about the overall look and on the right frame, sometimes less is more.
I'm a very average 34c. Was a 34b when I was younger but they've got a little bigger, drooped a little lol over the years so I'm just about a c cup but still a b in some bras xx