Regularly darned soprano's extremely long costume (5)

I believe the answer is:

dress

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

'long costume' is the definition.
'dress' can be an answer for 'costume' (I've seen this before). I'm not sure about the 'long' bit.

'regularly darned soprano's extremely' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'extremely' means to remove the middle letters (only the extremes of the word are used).
'sopranos' with its middle removed is 'ss'.
The alternate letters of 'darned' are 'dre'.
'dre'+'ss'='DRESS'

Can you help me to learn more?

(Other definitions for dress that I've seen before include "Frock" , "Uniform" , "Straighten the line" , "(Article of) clothing" , "clobber" .)

I've seen this clue in The Irish Times.

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