As for old days using wire coat hangers, you CAN do that. But that was when men were men and coat hangers were steel. But really man, buy some rod so you know what your getting.
As for the aluminum coat hangers, I ACTUALLY HAVE LOADS OF THEM!! My wife's grandfather used to run the local anodize plating company. WAAAAAY back in the last millennium, he had a job come in from the local vo-tech school. The Kids made some tooling in metal shop and produced a thousand or so of these really heavy duty roll formed and twisted ALUMINUM rod coat hangers. They had him anodize them all kinds of colors. Being that I and my youngest son (9) are the ones in the family line who LOVE all of Grandpap's TREASURES; his piles of random mismatched tools, thing-o-mo bobs, junk yard contraptions, home made garden/farm inventions and other "junk" as the rest of the relatives call it, HE GIVE IT ALL TO ME. YEA!!!! The kids gave him a few dozen as payment, and he still had them some 60 years later. Now they are in my closet.
As far as plastic coat hangers... I ACTUALLY WELD WITH THOSE sometimes. I find myself doing a lot of plastic welding. Just because it's cheap plastic made crap and broken, why throw it away when I can crack open the plastic welder and fix it. Yeah the color usually never matches, but hey; waste not, want not.
Yup, Owen and I are carrying on Grandpap's torch! My family calls my son the junk man, he has ideas for every scrap thing how he can use it. He even wants to save piles of saw dust. That he squeezes together with some glue to make tiny hay bales for LEGO people!
XRyan