Red coat tailored, 1930s style (3,4)
I believe the answer is:
art deco
'1930s style' is the definition.
(I've seen this before)
'red coat tailored' is the wordplay.
'tailored' indicates an anagram (the letters are customised ).
'red'+'coat'='redcoat'
'redcoat' is an anagram of 'ART DECO'.
(Other definitions for art deco that I've seen before include "Style of decorative art popular in 1920s and 1930s" , "Old style" , "Geometric style of ornamentation" , "Style of 1920s/30s" , "pre-war style" .)