AmericanBeauty

There used to be a few VS stores that carried swimwear, but I guess they closed now since we can't find it on the web site.
If you wear the clothings from VS, you can expect the swimwear to be in the same size.  A lot of their swimwear collections are inspired by their lingerie collection (eg. Very Sexy and Boby by Victoria swimwear), so you can purchase the same size as your VS lingerie from the same collection.