Meaning of 表裏 in Japanese

Definition of 表裏

ひょうり(hyouri) 【表裏】

(n, vs) two sides; inside and outside
彼の言葉には表裏がない。
He is sincere about what he says.

ひょうりいったい(hyouriittai) 【表裏一体】

(n, adj-no) the two views (of an object) referring to the same thing; being inseparable like the two sides of an object

ベストを裏返さなくちゃ。表裏ひょうり逆ぎゃくですよ。

You need to reverse your vest, it's back to front.