I found secret support vests or camisoles a godsend when I was having radiotherapy because after the first few treatments they told me to stop wearing a bra. Back in 2007 the ones I had were from Dunnes Stores and were actually made from t-shirt material as they were for holidays. Matalan do very nice little secret support camis in black and white which have a little lace trim on the v-neck. I often wear these in bed instead of a PJ top as they give me a bit of support on my lumpectomy side if it’s aching.