seriously tho, i just got a load of new bras after losing some weight (came off the pill and dropped one cup size in one month!) and omg your clothes fit so so differently wearing proper bras. do not be stingy when buying bras. a well fitting bra will avoid backache and will make you look slimmer and better. all your clothes will fit better.
i recommend wonderbra for UK residents, gives a good uplift where needed.Gossard and Playtex are good too. Playtex make good smooth bras when you need the outline not to show through the clothes.i am told La Senza is good for very big sizes.
i also recommend any decent underwired bras, make the bust good support and nice shape. however, some people with smaller bust find the wire cut into them so try it on first.
do not buy padded bras for everyday wear under some clothes it looks really really bad.
marks and spencers do a good bra fitting service, but their cheper bras are crap
avoid moulded cup bras ('t shirt bras') as when they a get old, they mis-shape and look like you have 4 nipples. also, under t shirts and tight clothes, they show alot of bulgyness.
also avoid anything cotton or with thin pretty straps as they stretch out of shape after one wash. get good strong bras made of man made materials
try them on before u buy, and put a thin top on top to see the tru fit under clothes