Excellent vintage condition considering its age but light signs of age and use should be expected. A really rare and amazing find.

One size best fit modern XS,S or petite M. This is only an estimation, please make sure to  check the lay-flat measurements below:
42cm-44cm across armpits (zip up fully, more room if zip down a bit)
35cm-37cm across waist
37cm shoulder to hem
36cm waistline to crotch
146cm nape to hem