Is this inappropriate from my tutor?

So I was in a seminar today. I was wearing a cardigan and I will admit- a tight crop top. I am a F cup bra so I was showing a lot of cleavage which is sort of unavoidable for me. I’ve worn this outfit before and no one said anything. It was hot so I took off my cardigan and one of my female tutors came over and quietly asked me to put my cardigan back on. While I was showing a lot of skin I don’t think my outfit was inappropriate. Student at Chester uni btw.