At my public hospital they told us we could use our own gowns so I wore a warm voluminous one from home which was comforting and very modest. I think that is a good idea.
My husband sat with me in the waiting room before every session which I found very supportive and I think helped him as well. Everyone there was either being treated or a support person for someone being treated.
The first session was a challenge for me being naked above the waist with several therapists, including a young man. I had 30 sessions and fortunately somewhere along the way I lost my embarrassment. I can pretty well show my breast to anyone now.