you cannot trade loompoints in their most basic ways, what you do is you buy the item from the guy for 1 gold (approx, if he wants to loom from +1/+2 to +2/+3), then you retire, loom that item and then you resell it to the other guy for the money (well, the money is moved at some point during the transaction, depending on the trust in the other part).
So to heirloom an item, you need the requirement (shield, str, PD, PT, riding, etc)