Arenanet announced today that they will be adding a preview feature to the trading post on the February update. In addition to the preview screen, weapons also now also be wielded or stowed in the preview window.
Try before you buy! You’ll have the ability to preview items in the Trading Post before you buy them. Simply right-click an item icon and select “Preview” to see the item equipped on your character. Check out how a weapon looks by itself, how it looks when sheathed, and how it looks when wielded by your character.