Hi Katie,
Yes you’ll need to sleep in your bra for 6 weeks. I would recommend getting the Macom signature bra, they’re good because all you need is your band size and the cup material just stretches to whatever size you are after your op. You get a discount through MYA as well if you’re with them. You can probably get cheaper post-op/compression bras in other places like M&S and I know some girls on here have brought their’s from places like Asda, but personally I would go with Macom xxx