I think crop tops are adorable but I also wear a 30DDD my sister size is a 34D. I am shopping on Amazon right now and I keep scrolling past a lot of them either because I think they're too low cut or too small. I also want something that is at least semi-conservative. Like these examples.
Most Helpful Girl
My bra size is 32DD and I can still find semi-conservative (how you call them) crop tops.
Just find the style and order in a size bigger than what you wear (i. e you wear XS => buy an S).2