Most MPAs would have no problem with catering to stocking fetishes however it is always a good idea to bring the stockings with you (new/in package).
Just a thought here..... I realize a lot of clients enjoy the sight and feel of pantyhose on a woman and there have been many posts on massageplanet.net, by you gentlemen, wishing more of us would wear them - as part of our "outfit". However, in terms of cleanliness....it's really not practical for us to wear them throughout the day unless we're bringing in multiple pairs so we can change after each session.
If we are wearing them for an entire day.... and if you'd like us to wear them during the session, you're likely going to be touching them, kissing them, whatever.....If an Mpa is wearing them during your session...it means she wore them in the session before yours....isn't that kinda a turn-off? Just a thought....
Best bet is to bring in what you'd like to see your attendant in and ensure that they are still in the package so both of you can be comfortable with the cleanliness issue. Give them to her prior to your shower so she has time to put them on before your session begins