The example I sighted uses Une tenue (not une chemise) and the correct answer was given as:
une tenue bleu marine.
The example I sighted uses Une tenue (not une chemise) and the correct answer was given as:
une tenue bleu marine.
Bleu marine is correct. It is an invariable compound adjective. (It does not derive from the word 'marin' but from 'marine' directly).
https://www.wordreference.com/fren/marine
Bonjour Michele,
To supplement Maarten's answer, here are 2 examples below:
Un pull bleu marine = a navy blue jumper/sweater
Une serviette de bain bleu marine = a navy blue bath towel
Trois vestes bleu marine = three navy blue jackets
I hope this is helpful.
Bonne journée !
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