He is a real collar and cuff person who loves fancy clothes.
collar and cuff
idiom Slang
Cockney rhyming slang · East London
puff
Origin
An effeminate man, suggestive either by their neatness of dress, or by "powder puff".
The politician was known for his collar and cuff style, always appearing in perfectly tailored suits.
His refined, collar and cuff appearance masked a sharp mind that was far more calculating than his elegant exterior suggested.