swimming costume
US /ˈswɪm.ɪŋ ˌkɑː.stuːm/
UK /ˈswɪm.ɪŋ ˌkɑː.stuːm/

1.
maillot de bain
a garment worn for swimming, especially by women
:
•
She packed her swimming costume for the beach trip.
Elle a emballé son maillot de bain pour le voyage à la plage.
•
I need to buy a new swimming costume before summer.
Je dois acheter un nouveau maillot de bain avant l'été.