Checked the fit of extremely refined clothing that is in fashion (5,2)
I believe the answer is:
tried on
'checked the fit' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'extremely refined clothing that is in fashion' is the wordplay.
'extremely' says to hollow out the word (remove centre letters).
'clothing' is an insertion indicator.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'in' indicates putting letters inside.
'fashion' becomes 'ton' (I've seen this before**).
'refined' with its centre taken out is 'rd'.
'rd' enclosing 'ie' is 'ried'.
'ried' going within 'ton' is 'TRIED ON'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for tried on that I've seen before include "Donned a garment to see if it suited" , "tested for suitability" , "Tested the fit of (a garment)" , "Checked shirt perhaps" .)