I'm 34H and have always lived by these rules, although not sure if they are the right ones! Firstly, good bra - bravissimo, get fitted if you can. then..
NEVER wear...
High necks
anything with pattern/detail right across from of boobs
Anything that is too small at boobs - rather be bigger on boobs and too big on waist - I rarely buy dresses, size 16 on op, 12ish on bottom, nightmare.
anything with too many buttons down the centre - see above, they always strain and look awful
dont wear long necklaces, they always either swing from side to side over boobage, or get stuck in middle!
Always...
Wear v necks, scoop necks, or cross over/wrap front dresses.
Go for stuff that nips in at the waist, or the smallest bit, usually just under boobs.
try and go for blocks of colour, but I sometimes ignore!
wear necklaces that break up big cleavage area.
umm what else, oh, no double breasted (ha!) coats, single buttons only.
Its very boring, but i just dont look at stuff that doesn't fit those criteria now.
I could be wrong though, someone might come along and shake the whole foundation of my clothing beliefs!!