How many letters does the top answer for “used of women's clothing having a hemline at the ankle” have?

The most common answer is maxi (4 letters).

Crossword clue: used of women's clothing having a hemline at the ankle

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

maxi 4 letters wn-def

a long skirt ending below the calf