I should start by saying that I am not diabetic and that my experience was over a quarter of a century ago, but I guess not much has changed. I had a date, turned up, they were overstretched, stayed a night, nothing was done, went away, came back a few days later, then the actual process took from arrival first thing in the morning to delivery in the small hours of the next morning. I'd had a "difficult" forceps delivery, so they kept me in for another three nights. In other words, even without diabetes, it can be a long, slow, drawn out process, with no fixed dates. I would fully agree that hospitals are overheated, sweaty sorts of places and your hormones will cause hot flushes anyway. I should also mention, regarding clean clothes, there is the issue of blood loss after child birth.
Having now painted a rather unpleasant and off putting picture, I had a healthy baby and all was well. So, my advice, if you can squeeze it into a bag and it can be lifted by one person, take it!
Very best wishes , I hope all goes well,
Sally