For immediate post op I got mine from asda too, (also from a few other places, but ended up wearing only the asda ones). Def recommend them, like the comment above, only around £6 in white and black and fitted perfect. Also, for just after post op, when you can start wearing underwired bras again, but still want something comfty- La Senza do soft cotten bras. You get a two pack again in white & black. Just really simple, but still wear them now a year later! Good luck!