My surgery was approx 3 weeks ago so speaking from experience you may have limited arm movement due to lymph node removal so shirts/blouse with buttons best thing.. I was in a hospital gown until I went home ..
Depending on which hospital you go to - I was given a pink kind of curved shaped pillow from a BC charity. Still using it nearly 3 weeks after surgery. I’m in Sydney too - I’m still wearing loose, button up light shirts ( linen or cotton)
. Easier to get on & off for check ups etc.
big hugs to you & all the very best for surgery.
thank you for your wishes - looks like i need a couple of new shirts :)