Trousseau has very large dressing rooms, comfy seats, and full length mirrors.  Also, their staff is not pushy, and gives you plenty of privacy.  www.trousseaultd.com.  Enjoy!

Hugs and Kisses

Of course you have to let the provider know ahead of time and she has to agree. I never pay for this of course, and its off the clock. First, you have to research the stores, some stores only have a limited selection of lingerie or erotic clothing, and some stores do not have a fitting room. I usually take girls to "erotic shops" in VA. I buy them plenty of toys and erotic clothing. I never ask them to change into them, cause most girls already know their size and don't even try the fitting room. So, I usually book them afterwards for a couple of hours. I can see them in all of their outfits and I get to play with them with the toys I've bought them. In most cases, girls are appreciative of my generosity, and will give me a discount for the multiple hours. I recommend you do the same if you want to see the girl and play with her in your own setting.

I found online a store in DC called Coup de Foundre.  It seems to be similar to Jaryam.  I called and explained that I wanted to bring my "girlfriend" to pick out lingerie with her.  The store employee told me that men were welcome to be in the fitting rooms with their ladies.  

Perhaps an interesting side point is that ladies (at least at Coup de Foundre) must wear panties underneath any panties they try on...for obvious reasons.  This rule does not apply to other lingerie.  

And thanks McDonald000...you've given me some good additional food for thought!