Hmm I can see the problem. There's probably two ways you could go in. Either be much more vague about what she's wearing (as in, "her outfit consisted of little more than strips of leather strategically covering her modesty" type of thing) or be much more detailed, so the reader understands exactly what she's wearing. The problem with being that detailed is that it can serve as a bit of a road hump in your story, especially if it's not really all that important what she's wearing. As I alluded to before, you may find an opportunity a bit later in your story to describe her outfit a little more - perhaps as she removes an item, or it comes untied, etc.
That's one problem with writing for a fantasy genre, it can make it hard to describe things without using modern day comparisons. I've ran into that problem myself. Anyway, good luck!