With ormolu hem, expensive coat need not be thrown away (6)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

[ormol]U (hem or edge of – although ormolu (a gold-coloured alloy of copper, tin or zinc, used to decorate furniture) seems a strange material to have chosen here) + SABLE (expensive coat) – the cryptic grammar doesn’t quite work for me