Most of your potential customers are women, and they will respond far more to "designer" than "fitter." See, you already are not thinking like one, and that'll cost you more customers. When you use such words as "designer" in your copy, you plant images in your audience's head. Besides, you have described yourself as more than just a designer anyway. You have to be both if you want to get even more customers. And they are not two different jobs. Many in your line of work are both. They also give advice. (You have to put all that in your copy.) Those are the ones who are more successful. Hope you have success with it.