Crossword Genius

As worn by good girls? (7)

Ross

I believe the answer is:

glasses

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

'as worn by good girls?' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

'good girls?' is the wordplay.
'good' becomes 'g' (abbreviation).
'girls?' becomes 'lasses' (lass is a kind of girl).
'g'+'lasses'='GLASSES'

Can you help me to learn more?

(Other definitions for glasses that I've seen before include "Spectacles and receptacles" , "are they full of alcohol?" , "Spectacles or drinking containers" , "Spectacles; schooners" , "Drinks" .)

I've seen this clue in the Evening Standard.
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