Upon arrival if I notice he had on a towel I would think he's pressed for time and wanting to get down to busy and cut the small talk. I would like a little warning, Like hey 'I just hop out of the shower and I hope you dont mind if I leave on my towel or rob". Even dress in the fluffy hotels robs is a nice idea.
I Agree with Caroline Davenport when we first meet I like to see a nice suit or slacks and button shirt. I spend a lot of time putting together my outfit to look perfect and if its a special request I'll go shopping just to make sure I meet what he require.