To be over dressed 'as a
ponce' especially if one is ordinarily rather conservative in dress. Applies mainly to men. Not a compliment but an observation, sometimes with negative connotations.
eg a
man dressed in a suit and tie for a date or interview and wearing sftershave, when he normally dresses casually and is unshaven, is an example of someone who is 'poncified'.
See the film '
Alfie' starring Michael Caine, where the word is used.