Easily done as transmogs.
Speaking of transmogs we need underwear transmogs as a bottom’s counterpart to the shirts. Some of these could be swimsuit bottoms to be used alongside swimsuit tops, useful for ladies that want to mix different tops and bottoms. Also, we already have the black magewave top and bottom parts to form something looking like a full suit BUT they come with long stockings, and we cannot have that on the beach. Besides they are cloth and as such can only be transmoged by cloth wearers. That is unless gear is made to be useful as mogs for all classes. In any case I considered this month’s products for sale at the trading post to be a bit underwhelming this month so adding some swimsuits should be a nice and quick addition going forward.