der Badeanzug
swimsuit
A one-piece item of clothing worn mainly by women and girls for swimming or bathing.
Für den Schwimmkurs braucht meine Tochter noch einen neuen Badeanzug.
My daughter still needs a new swimsuit for the swimming course.

swimsuit
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swimsuit
A one-piece item of clothing worn mainly by women and girls for swimming or bathing.
Für den Schwimmkurs braucht meine Tochter noch einen neuen Badeanzug.
My daughter still needs a new swimsuit for the swimming course.

The word is a compound made from the verb 'baden' (to bathe) and the noun 'der Anzug' (suit). So it is literally a 'suit for bathing'.
Pack deinen Badeanzug ein, wir fahren an den See!
Pack your swimsuit; we're going to the lake!
The word part 'Bade-' is used for many items related to swimming and bathing. Other examples are 'die Badehose' (swim trunks, for men), 'das Badetuch' (bath towel), or 'der Bademantel' (bathrobe).
Vergiss nicht Badehose, Badetuch und Sonnencreme für den Strandausflug.
Don't forget swim trunks, a bath towel, and sunscreen for the beach trip.
Typical verbs used in connection with a swimsuit are 'einen Badeanzug anziehen' (to put on a swimsuit), 'tragen' (to wear), or 'kaufen' (to buy).
Ich muss mir für den Urlaub noch einen neuen Badeanzug kaufen.
I still need to buy myself a new swimsuit for the vacation.
bodysuit / body
'der Body' and 'der Badeanzug' can look similar because both are one-piece garments and fit tightly to the body. The difference is their purpose. 'Der Body' is a piece of clothing for everyday wear, as underwear, a top, or for babies. It is usually not worn for swimming. 'Der Badeanzug', on the other hand, is specifically for swimming or bathing. Learners may confuse the words if they only think about the shape. So pay attention to the situation: clothing for everyday life is more likely a 'Body', while clothing at the swimming pool is a 'Badeanzug'.

Für den Schwimmkurs braucht Sofia einen neuen Badeanzug.
Sofia needs a new swimsuit for the swimming course.
Unter der Bluse trägt Anna einen schwarzen Body.
Under her blouse, Anna is wearing a black bodysuit.