Small matters worried fashionable types (5,3)

I believe the answer is:

smart set

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'small matters worried fashionable types' is the definition.
I can't judge whether this defines the answer.

'small matters worried' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'worried' is an anagram indicator.
'matters' is an anagram of 'martset'.
's'+'martset'='SMART SET'

Can you help me to learn more?

(Other definitions for smart set that I've seen before include "Trendy folk" , "Fashionable elite" , "Mattress (anag) - "in" crowd" .)

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