revealing

a.（衣服）暴露的，使身體過分裸露的、透露內情的；發人深省的
Revealing clothes show more of the body than is usual;showing something that was not previously known or seen

She was shocked by a culture where performers compete to wear more revealing costumes an and often undergo cosmetic surgery and breast augmentations.

A joke can be very revealing about what someone’s really thinking.