Crossword Genius

Dull serfs improved in formal attire (4,5)

Ross

I believe the answer is:

full dress

I'm a little stuck... Click here to teach me more about this clue!

'formal attire' is the definition.
'full dress' can be an answer for 'attire' (full dress is a kind of attire). I am not sure about the 'formal' bit.

'dull serfs improved' is the wordplay.
'improved' indicates anagramming the letters.
'dull'+'serfs'='dullserfs'
'dullserfs' with letters rearranged gives 'FULL-DRESS'.

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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