How many letters does the top answer for “formalwear consisting of full evening dress for men” have?

The most common answer is tailcoat (8 letters).

Crossword clue: formalwear consisting of full evening dress for men

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

tailcoat 8 letters wn-def

formalwear consisting of full evening dress for men

tails 5 letters wn-def

formalwear consisting of full evening dress for men