Deebra,
If you are sufficiently out this scenario almost happens . When I go into a store and pick out items I like , I may chat to SAs about sizing or whatever and then make my way to the changing area . I often walk out of the cubicle to check in the full length mirrors often SAs are supervising the area and offer advice or a definite thumbs up . Very often there are other female shoppers coming and going sometimes they stop to check out the item and make their own comments . So far I haven't come across a TG/TS SA but I'm sure it will happen and realistically what difference would it make . If the price is right for quality goods people don't need much persuading no matter who may serve them .

Why would those in the closet be any braver to come out and shop , no matter how user friendly the situation may be people will always make comments good or bad . The stores couldn't afford to turn women away, competition on the High Street is too fierce to be that selective .

I hate to say this Deebra but it's all in your dreams !!