Have something/somebody written all over it/somebody
Definition 1 of 2
Pro Tip 1/3Clearly Evident
The phrase often points out an obvious trait or behavior that's unmistakable. 
His nervous gestures had guilt written all over them.
Pro Tip 2/3Personal Involvement
Suggests someone's personal touch or involvement in something. 
The decor has her style written all over it.
Pro Tip 3/3Figurative Speech
This phrase is metaphorical, not literal; no physical writing is involved. 
The game plan has the coach's philosophy written all over it.