A portmanteau or combination of the words classy and whorish. Meaning to dress chic, fashionable, or elegant, but also appear to look very slutty at the same time. For instance if a girl were to be wearing knee high socks, a white blouse, and a red plaid skirt she would be labeled as slutty or whorish for wearing a school girl outfit, even though she might not be in the least bit revealing in attire. Hence, clorish.
"Ugh, I hate Abby!. All the teachers love her but she always wears such slutty clothes!"
"It's because she dresses clorish. She doesn't break the dress code but still looks like a slut."