Hi and welcome to this forum - sorry about the reason for joining it though.
I took a tonne of stuff to the hospital including nighities (I wear oversized tshirts as 'nighties') but found I stayed in Hospital gowns throughout and highly reccomend it both because you will be covered in the pink desinfectant which colours clothing so may as well stain their gowns and not yours plus I kept on sweating profisely that 1st night so being able to just grab another gown and chuck the stained one for someone else to worry about was great.
I got a large packet of baby wet wipes and they were a lifesaver as cannot shower with the dressings so being able to wipe myself down and refresh was fantastic... Being clean in spite of profise swearing was great. Turns out the rest of he ward felt the same as half the ward was knocking on my door throughout thennight asking for some so I definitely highly reccomend it.
Also ask the hospital or the surgeon to put you in touch with the breast care nurse as they are invaluable... They will be able to answer any question you may have and will have fantastic suggestions of dos and dont's for both ore and post surgery
All the best
hugs
Jel