I don't know any RMT's who encourage undraped, but some will tolerate it, or lightly drape with a washcloth. Amy at Oasis is probably the best I've seen. She gives a great massage with lots of teasing, roll over, undraped, excellent finish.
The girls at Xioping are good, draping not required, but no HE. Plenty of teasing though.
Kelly is excellent at Samba Massage. Have heard that Sunny on Whyte ave is good, but have not seen her yet.