revealing

US /rɪˈviː.lɪŋ/
UK /rɪˈviː.lɪŋ/
"revealing" picture
1.

making interesting or significant information known, especially information previously kept secret

:
The documentary offered a revealing look into the artist's private life.
His latest book contains some very revealing insights into his political views.
2.

(of clothing) allowing a lot of the wearer's body to be seen

:
She wore a very revealing dress to the party.
His shirt was so thin it was almost revealing.