There is an episode of Murder She Wrote from 1984, "Birds of a Feather" which features drag artistes.
Guest stars include Martin Landau (Mission: Impossible) as the murder victim, Jeff Conaway (Taxi), Gabe Kaplan (Welcome Back, Kotter) and Dick Gautier (Get Smart, When Things Were Rotten).
Jeff Conaway in drag is hideously ugly. Dick Gautier in drag is absolutely stunning. Angela Lansbury isn't in drag. Her character always dresses like that.
Thank you for your post and suggestion.
I am afraid it does not ring any bells so I think it is very unlikely to be what I viewed. Nonetheless worth having a look at the episode and the actors in drag.