I’ve been planning on getting the lululemon define jacket and the size chart seems a bit odd to me, so I’d like to get some advice on getting the correct size.

The website suggests me to get a size 16 or 18 since it only shows chest measurement, but I think it would be too big since most of my normal clothes range from L-XL and around EU44. (EU44 converts to size 12 in the lulu sizing chart)

The sizing chart does not tell if the chest measurement is underbust or overbust, which causes my confusion.

For reference I am 173cm (I think it is 5’8") with slightly wide shoulders and my waist-chest(overbust)measurements are around 92cm-115cm (36"-45")

Also, there seems to be two options for the material, which one would be better since I would prefer it to be a bit sturdy?

Obligatory written on mobile and english is not my first language, but hopefully I will get some good answers here.