Batik Shirt Pants Set, Indonesian Oufit, Ethnic Clothing, Made by Mandarin

Description

Batik Shirt Pants Set, Indonesian Oufit, Ethnic Clothing, Made by Mandarin, Size 12
Please forgive me if I am incorrect with my description. I have studied for a few hours now and am not positive that this outfit is Indonesian.
This shirt and pants set was made by Cameron Textile Industries of Hong Kong and the clothing line (I believe) is called Mandarin. The fabric looks like Batik to me in green, golden yellow, dark teal, and white. Factory stitching so maybe from the 80s? Probably Cotton. This is only my best guess. They are both labeled a size 12. Is this US size 12? I have no clue. Excellent condition!!! Please refer to the measurements provided below.
The pants have an elastic waistband along with a zipper in the back and a metal hook & eye fastener above that.
The top/blouse/shirt has a nicely pointed collar, shiny metallic buttons up the front that are actually plastic, breast darts, and one dart above each shoulder blade.
Laid flat to measure:
Top:
Shoulders: 16.5" seam to seam
Underarms: 19.5" across the back; approx. 39" around
Sleeves: 18" from the shoulder seam down
Total Length: 28.5" from the bottom of the collar down the back
Bottoms:
Waist: 12" across NOT stretched; 16" across FULLY stretched; 32" around FULLY STRETCHED
Rise: 15"
Hips: 21" across; 42" around
Inseam: 27"
Leg Openings: 10" across; 20" around