au naturel

US /ˌoʊ nəˈtʃʊrəl/
UK /ˌoʊ nəˈtʃʊrəl/
"au naturel" picture
1.

in a natural state; without artificial additions or adornment

:
She prefers to wear her hair au naturel.
The chef prepared the vegetables au naturel, with just a touch of salt.
2.

naked

:
They decided to go for a swim au naturel in the secluded cove.
The artist preferred to paint his models au naturel to capture their true form.