Girls, What does it mean when another women makes fun of the way you dress?

Anonymous
A random lady at work judges me and makes fun of me with her friend for no reason. she's new and older. She always watches, whispers, and snickers to a friend she made as we walk by.

So strange, because I've worked there longer than her. (I'm still new to a work environment, so I dont know if this is normal). Maybe what I wear is inappropriate, I don't know. But It gets super hot where I work and that day I decided to wear a halter crop-ish top with high waisted loose joggers. (and we wear lab coats over our clothes anyways) And they walked by saying "tryna be sexy". Yet they wear much more revealing and tight clothing.

I've never experienced this at work before, only back in high school..
Why do they care about how I dress? Is wearing revealing clothing inappropriate in a production work environment?
Girls, What does it mean when another women makes fun of the way you dress?
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