He looked at me. Not the other way around.

So I started at 310 on Jan 3rd this year and now Im 265. I feel comfortable and beautiful. I bought a nice dress and some fishnets. I wore them to my husbands parents house and as a favor I go to pick up my sister in laws boyfriend from work with her. She gets out of the car and then he does too. He sees me. Stops walking. I walk in front of him and then she stops walking as she gets near the front door. She turns around and sees him looking at me checking me out and proceeds to scream about him looking at me and how Im married and he needs to stop checking me out. Okay. First of all. Im not going to stop dressing nicely. I should not have too. Any time a woman walks by my husbands eyes drop to the ground out of respect. He doesnt have too but he does so its definitely possible. My thing is, she made me feel completely embassed and uncomfortable. What would you have done if you were her? I would speak to him elsewhere so the innocent person (me) didn't have to feel any certain way. What would you do? And when I say what would you do I mean if you were her.