Clothes hanger trolley DIY
I have seen a similar item made completely out of pvc pipe, with the pipes joined together with pvc cement. You make a couple of rectangles (instead of triangles) of pvc for the bottom of each side, say 1 ft high by 2ft wide. Then from the top middle of each rectangle (the 2ft long side), have a tee in the middle to a pipe going up, and then the topbar between the ends of these uprights. Of course, if you have the scrap wood already on hand, that is probably cheaper. You can still use a pvc top piece, just cut a hole in the wood to fit and put a bolt through the pvc on either side of the end piece to keep it in position.
Hope this helps.