I have this too. I keep a distance from people and I don't touch or hug them unless they take the initiative. I'm afraid other people find me disgusting.

I don't think she dresses differently because of you. There could be several reasons why she wears jeans now. Maybe she had enough of skirts or she has decided that jeans are better for sitting in a chair all day than skirts. Maybe it's just a coincidence. And yes, it could also be that she doesn't wear skirts anymore because she thinks it could be distracting for clients. But that doesn't mean it's because of you. She probably has more male clients.
If you haven't been staring at her legs, then I don't think you're the reason she doesn't wear skirts anymore.
I also don't see why jeans would be better than long skirts. In those long skirts you really don't see much legs. My T once wore a thight dress above her knees (it was really warm) and I can see that that might be distracting for male clients. It was distracting me, I wanted to look at her legs. I have only see her in jeans and long pants, even when it was a hot day. But I'm sure it's not because of me.