I wore the same underwire bra I'd worn pre single mastectomy for a year after, with no difficulty at all, apart from the annoyance of a soft pad which tended to float upwards (I had a large and persistent seroma and a prosthesis was difficult to fit until it was finally resolved). Post seroma, I was fitted with my first wirefree prosthesis bra, which was and is remarkably comfortable. I seem to have been completely untouched by any bra lore, recommendations or freebies throughout, with no adverse outcomes at all!