Look a fright
Definition 1 of 1
Pro Tip 1/3Emphasis on Messiness
The phrase suggests a strong degree of untidiness, more than just casual dishevelment. 
After the windstorm, her hair and clothes looked a fright.
Pro Tip 2/3Colloquial Use
It's informal and best suited for casual conversations, not for formal writing or speeches. 
You can't go out like that; you look a fright!
Pro Tip 3/3Expression of Surprise
Often used to express surprise at someone's unusually unkempt appearance. 
Wow, you look a fright! Did you get any sleep?