Staff - PvP The Crossing
So… still no official answer…
Server: Seafarer’s Rest
Unfortunately I have a feeling that you can’t… Currently the only way I know of to get PvE skins in their PvP form is with the actual skin consumable. As far as I know, The Crossing doesn’t have a skin and must be forged in a similar manner to Legendaries.
You cant get new pvp skins by doing pvp, you have to do pve and buy keys, then unlock some pve chests and then when you get skin transmute it to pvp item.
Source: https://forum-en.gw2archive.eu/forum/pvp/pvp/Halloween-pvp-items-drop-from-chests/first#post3040791 red post