I’m the lucky owner of 2 59’s Durable jackets, one size 46 in good « worn »condition, and one in size 44 in an excellent condition (leather and hardware still shiny!), this one also has its original detachable faux fur collar. of course the detachable collar doesn’t fit the size 46, and it’s a small deception to me that it has a synthetic mouton fleece. So I’ve been planning in my free time, on reproduce this collar for my bigger size jacket and one with a real mouton panel! that’s the amateur experience in modestly share with you. So please don’t be too harsh, as it’s a trial and errors fun activity . the result is far from perfect but it does the job. here’s a few Picts of the process. first, tracing a pattern from the original collar, and extrapoling the measures… cutting the parts in an heavy paper/cardboard. Disassembling a vintage golden mouton coat cutting the leather parts sewing as best as I can, with my 70’s industrial JuKi Sewing machine Aaaaaand, here it is! The leather I used is a bit stiff but hopefully it will soften.