It's a web log gag reference (which has propagated it's way to FR). Harry Knowles has the habit of obsessively posting "MAN IN SUIT! MAN IN SUIT!..." whenever discussing the new Japanese Godzilla movies on Ain't It Cool News.
The Man In Dress Alert in the keywords was directed at Mr. Tootsie hosting tonight's Grammys.
The MAN IN DRESS! is reference to Harvey Firestein in case you are on the left coast (or not watching).