I know that I'm not very smart, so which part of this is clever? is it the pattern on her cloth?
or the flying clamp?. I just don't get it

See post #637756

This has become a normal meme.
It can't "excel in originality" anymore and therefore can't be clever.
(although this means that the first appearance of this is clever and all others aren't. If you ask me, this meme wasn't clever to begin with.)

Hatate's disguise is almost perfect.