As the title suggests, when you put a snakeskin jacket made in a hamlet world on a shelf in a player house, it will retexture into the shipwrecked variant. Taking the jacket from the shelf reverts the textures back.
I used no mods for this and I'm guessing this only occurs for those who happen to own both the SW and HAM DLCs.
I've yet to try if this also would happen to the snakeskin hat, but I assume it might.
Put a snakeskin jacket on a shelf inside a player house.