Suit – le costume
(Pronounced kos-tewm)
To remember that Suit is pronounced kos-tewm (costume) in French, use the following mnemonic:
Under the suit, he wore a superhero costume (costume).

Costume is masculine, so it's le costume. Imagine the early learner being measured for a suit.

Examples of costume (suit) in a sentence
Il porte un costume élégant.
(He is wearing a stylish suit.)
Elle préfère les hommes en costume-cravate.
(She prefers men in a suit and tie.)
C'est un costume trois pièces.
(It is a three-piece suit.)