Surgery on Thursday: Need sleepwear suggestions please

Dear Tasia, 
I’ve looked through my photos for a picture of my Dilly bag for drains and couldn’t find one. I’m guessing it was 35-40 cm square with a shoulder length strap. I had 2 drains, I’m not sure if anyone has  more than this.  You could easily make one of you sew. You may have a shopping bag that could be useful. A pillow case in hospital could work, but you would have to hold it all the time walking with your hand.