Has anyone tried the Reiss Dax jacket and could comment on sizing?

[Bettyhatesavocados]

www.reiss.com/p/short-puffer-jacket-with-side-zip-womens-dax-in-stone-brown-cream/?_cclid=Google_EAIaIQobChMIkMaL0Lqo7QIVh7btCh3ClQY1EAQYASABEgKsx_D_BwE&gclid=EAIaIQobChMIkMaL0Lqo7QIVh7btCh3ClQY1EAQYASABEgKsx_D_BwE

The size guides on John Lewis and Reiss seem a bit different. Confused as to best size for a 10-12.

Thanks!