This information can be found on Americanintimates' "about us" page
(there's a tiny hyperlink at the bottom of their home page):
However, when I dialed this number it was busy, so I did some
additional checking for you.
The Americanintimates.com website lists its adminstrative contact address as:
326 Grand Street
New York, New York 10002
A Google Search for
Rosengarten Apparel, New York, NY
also yields the following information:
Rosengarten William Apparel Ltd
326 Grand St
New York, NY 10002
At that number, I got an answering machine on which you can leave a message.