Hey Claudia,
Before op, I would, as Louise said, buy all of those things, id buy clothes that have zips too to wear in the daytimes as you cant really lift your arms above your head for a while… take an ipad or something in hospital with you too cos it does get boring as your in your own room (presume its the same for everyone) and they have wifi 🙂 so keeps you occupied a bit!
After op, All I would say is get everything around u at home so its all easy reach 🙂 so u dont have to stretch high or low to get anything, get it all on your level the things you need. Even when you have strapping (if u do) i would still put on a sports bra for extra support.
How exciting! I had mine done on Wednesday 5th just gone… so exciting. I have posted some pics if you want to add, you can see 🙂 what size you having? 😛 xxx