This is an M&S Per Una black cardigan in size 14.  Made from a medium weight plain knit fabric, it has long sleeves (raglan) and a plush fur fabric detachable collar going down both fronts.  Without the collar it's a plain black open front cardigan, with the collar it's a far more luxurious garment.  The collar attaches by a number of tiny black buttons and elasticated loops.

The washing instructions are extremely pale on a pale label so not very clear to read, but the cardigan should be washable without the collar.  Excellent condition, no wear, hardly worn. Measurements - Length back collar to hem approx. 59cm, armpit to armpit approx. 45cm.