I'd report it too. Let's take the (understandable) upset about it, views about whether anyone is overreacting etc out of it - at the core, anyone at work making comments on anyone else's body, whether complimentary or negative, is just not appropriate. If it had been a positive (creepy) comment about your body it would be viewed as sexual harassment, there's absolutely no reason why a negative comment letting you know a colleague is looking at/noticing your body is 'okay' in harassment terms just because it's not sexual.