underdressed

US /ˌʌn.dɚˈdrest/
UK /ˌʌn.dɚˈdrest/
"underdressed" picture
1.

malvestido, vestido de forma inadequada

wearing clothes that are too informal for a particular occasion

:
I felt completely underdressed at the fancy restaurant.
Senti-me completamente malvestido no restaurante chique.
She was worried she would be underdressed for the gala.
Ela estava preocupada que estaria malvestida para a gala.