Clothes Hanger Wire !
Try a magnet on the wire, if it sticks, it can probably be silver soldered.
I have in the passed used soft solder on such wire but that was one example.
Heat a sample to a good red heat.
The problem is that there is no standard for these items so you will have to check each hanger to see what will work.
A better solution would be to measure its diameter and buy brass wire or tube of the same diameter, that will give you a material of known parameters.
"that's not a bug its just an undocumented creature."
Sir Terence David John "Terry" Pratchett, OBE (28 April 1948 - 12 March 2015)