In LastChaos, with the weapon or armor melded, the item is not tradeable. To take off the item to trade or sell, you would have to purchase the Big Book of UnMelding. Simple click the book and put the item in the square and confirm. The book then seperates to two, so that you will have an item that now is tradeable.

Now if you unmeld an item(Last Chaos Gold), the cover or outfit is still good. It will not vanish from your inventory till the 30 days are up. So if you had a weapon with cover for 2 weeks and then upgrade your weapon to the next level. You could unmeld your old weapon and use the cover on your new weapon, which at that time would have about 2 weeks left. Make sure you buy the correct covers also for your item.

Duals sword covers will not work with single sword covers. That is, if you have dual swords you would purchase the Knight Strange Dual Sword Covers. Then the Single Sword, used by Templar Knights, you would purchase the Knight strange Sword Cover. If you purchase an armor outfit, look at purchasing the western outfit as that has a cover for the head. Here is Last Chaos powerleveling.