Wool challis black, green, purple, red and white geometric print dress from the 1960s or 70s

This wool challis black, green, purple, red and white geometric print woman's dress has a plain round neck with no collar, long straight sleeves with cuffs and covered buttons. The front is plain and slightly gathered at the waist seam. The dress zips up the back. The dress is part of an ensemble which includes a black knit jumper. The jumper is a chemise with a mandarin collar and large black button at the shoulder. The skirt is slit to the waist. There is a narrow black leather belt. …