I was still on an IV when I went for walks. I wasn’t cold but we are all different. I couldn‘t even get the new robe on that I bought for the hospital because of the IV, so they just snapped on another hospital gown, it snapped together at the shoulder seam.
You probably won’t be in the hospital that long, and you won’t walk that much, so you might be fine without the shawl.
thanks @Celle and @Jockette I have a shawl pin and a shawl I knit years ago....alternatively I could crochet a poncho, since I am sitting around so much and likely have a month or more before surgery. 9 days till I see the surgeon for my first appointment.
I never had an IV after I was awake after surgery. With my first knee, I stayed overnight, and went to PT that afternoon with no IV. With my second knee 5 months ago, I was outpatient. Surgery was at 10:15 am and I was in the car heading home at 3:15 pm. So it may not even be an issue. But the poncho would feel cozy even in bed.