Fashion red coat in a particular style (3,4)
I believe the answer is:
art deco
'a particular style' is the definition.
'art deco' can be an answer for 'style' (I've seen this before). I'm unsure of the 'a particular' bit.
'fashion red coat' is the wordplay.
'fashion' is an anagram indicator.
'red'+'coat'='redcoat'
'redcoat' is an anagram of 'ART DECO'.
'in' is the link.
Can you help me to learn more?
(Other definitions for art deco that I've seen before include "Style of design popular in the 1920s and 1930s" , "nineteen thirty's style" , "Style of decorative art popular in 1920s and 1930s" , "Early C 20 style" , "Redcoat (anag) -- inter-war design style" .)