How to tell if a guy is checking you out or is judging you?

I catch guys glancing at me a lot or will stare and then look away. Specifically at bars and I don’t wear anything provocative. I wear pretty classy clothes and I’d like to say I clean up nice. I’m asking because I hate being stared at or constantly looked at because I feel like I’m being judge. I do get a lot of compliments on my look from women by how I dress or even my makeup. So my question is, how can I tell if a man is judging me compared to just trying to get my attention?
How to tell if a guy is checking you out or is judging you?
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