die Kostüme (Dativ Plural)
Translation
(to/with/in) costumes (dative plural)
Examples
Mit diesen Kostümen gewinnen wir den Preis.
With these costumes, we will win the prize.
Die Schauspieler treten in bunten Kostümen auf.
The actors perform in colorful costumes.
Grammar Patterns
mit+3 (with sth.) With these costumes, we will win the prize.
Similar Words
in Verkleidungen (in disguises), mit Anzügen (with suits)
Etymology
'Kostüm' + dative plural ending '-en'. A common pattern for dative plural nouns in German is to add an '-n'.
Memory Tips
This is the dative plural of 'Kostüm'. You'll see it after prepositions that take the dative case, like 'mit' (with) or 'in' (in). The final '-n' is your clue.