Feeling chilled during colonic

I have been having a real problem feeling cold during hydrotherapy sessions. So much so that I feel that I am unable to relax, and I think it's causing me to have cramping and making the speculum uncomfortable. My therapist has checked the water temperature, and the temperature in the therapy room isn't too cold. I am thinking of trying a thermal bodysuit that I have seen. It's a one-piece with arms and legs with feet, and it has a relief zipper that goes through the crotch. I think it would open enough. They also make a matching hood for it, too. It has to be better than a hospital gown!