I'm a 34GG so they certainly have a tough job to do! I have bought some great ones from Bravissimo - they are very supportive and a great fit, but I find that I only get about 3-4 months out of them before I have pulled the straps as tight as possible but the elastic has started to go and I just look a bit 'saggy' when wearing bra.
Is this normal for the large-of-chest? Do I just need to suck it up, or are there other brands you would recommend which last longer?
Disclaimer - I wash my bras in the machine. Life is too short for handwashing so I''m not prepared to start 