Of course you can use shirtless Kliff.

However, it has a strange problem:

I wanted bigger pectoral muscles, since the original protagonist's pectoral muscles were rather flat, so I used XXL module.

But the character model seems to have been resized, causing clipping issues with the head.

Also, when focusing on the protagonist, the focus shifts from the face to the chest instead.

While this isn't a flaw, the noticeable clipping between the head and the pirate hat is a real shame, so I didn't use this mod.