Features:
Concealed back zip
Stretchable 
 
(If in between sizes: size down for a snug fit, size up for a comfortable fit)
 
The model is 170cm, fits into UK6-8 clothing sizes, typically wears a size S.
Her pit-to-pit is 32", waist 25", wearing size S. 
 
Please allow for up to a 0.5-inch difference due to potential variations in measurements.