just need an iron bra^^ change every six months, they're bored. Need something new.
Wow, 40D? Okay, I'm 32A so I'm probably the last person to ask. I hardly wear them at all and when I do, it's usually a sports bra. I buy a new one maybe once every couple months and rotate through the ones I wear.
Oh my gosh, I'm terrible at this. Mostly because I don't buy underwear to impress anyone. XD A good old comfy, worn out bra where the straps don't dig in will do me fine. I probably buy about less than 10 bras a year. xD
OFTEN BUT THEY ARE OUTRAGEOUSLY EXPENSIVE
I replace mine every 2 months as mine stretch. (I'm 28E)