This is an absolutely stunning set, made in NZ by the fashion brand Allure. I believe this piece to be 90s. The fabric is a shimmery Rayon Nylon in a pewter gold.
The top is labelled size M and the pants labelled size 14 but the pants are designed to be worn at the waist and with vintage sizing you need to knock off a few sizes. Modelled on me a size 8-9 and it was a good fit.
 
Measurements.
Top  - Pit to Pit - 55cm, Hips - 54cm, Length 75cm
Pants - Waist flatlay - 37cm, Rise - 34cm, Hips flatlay - 56cm, Inseam leg - 70cm