Plundered Crimson Captain's Hat is stackable

[Apzdalaran]

On my demon hunter I was lucky enough to get two Plundered Crimson Captain's Hat, When the first one dropped I obviously equipped it for the appearance. This normally binds it to your player, which it did. Later on I got a second hat and noticed they stacked. When they stack the Bop becomes Boe. I shared the hat with my friend and he did the same thing, and he was able to trade it back. I don't know what good this information would be besides attempting to sale the appearance by itself and you could only do that if you trusted them.

Here is a bare-bones guide, but it's pretty self explanatory:
Island Hats stack - Album on Imgur

[Link*]

Thanks for the heads-up!

FYI: You must drag the soulbound item onto the BoE item for this to work. It will not work the other way around. Additionally, if you already have a soulbound hat in your bags, picking up a second causes both to become soulbound. Stick the soulbound in your bank, first.

[advanta]

On my demon hunter I was lucky enough to get two Plundered Crimson Captain's Hat, When the first one dropped I obviously equipped it for the appearance. This normally binds it to your player, which it did. Later on I got a second hat and noticed they stacked. When they stack the Bop becomes Boe. I shared the hat with my friend and he did the same thing, and he was able to trade it back. I don't know what good this information would be besides attempting to sale the appearance by itself and you could only do that if you trusted them.
]

You'd be surprised what diamonds may lurk in the rough. Ty for post.

[BenjiBenji]

wowhead says its stackable, but it would reset the SB var. when stacked with a BOE
Plundered Crimson Captain's Hat - Item - World of Warcraft