Hi Suzf, throughout radiotherapy I also had real hassles trying to find some sort of comfortable bra to wear. In the end, I lived in Bonds Crop tops that I got from the underwear department at Big W! The great thing about them is that they have no side seams therefore they don't irritate under the arm, and they don't have a thick, stiff row of elastic inserted under the boobs either which makes them really comfy! (the material is elasticised which gives the support). From what I remember they were cheap too which is always a bonus (under $20). They are cotton and elastine which is great for the warm weather, and they come in white and black. I bought mine a size or two bigger than I'd normally wear to accomodate swelling etc and that worked really well for me. I found them great to wear for just lazing around, going shopping, to and from the hospital etc....I dont know if I'd wear them jogging or doing aerobics though....I don't think they'd be supportive enough (for me anyway!) Next time you are near Big W perhaps have a peek and see if you can spot them...they were the best thing I bought...so much so that I even slept in them!
Goodluck, Celeste x