Vintage St John Red Santana Knit single breasted blazer. 
Peak lapel with gold signature buttons.
Santana Knit: 80% wool 20% rayon
Made in the USA
Vintage Size 6 - see measurements- measured flat - double bust, waist & hip. Estimate modern Medium 
Shoulder: 15” with tacked in shoulder pads-easy to snip out if you choose.
Bust: 18”
Waist: 17.5”
Hip: 18.5”
Outer sleeve: 23.5”
Center back length: 23”
Good Vintage Condition