Seraphine coat - do they run big or small?

[AriadneO]

My question is two-fold:

1. does Seraphine run big or small? I'm normally a size 8, so would a wrap coat in 10 be ok or enormous?

2. also, I'm not currently pregnant... is it crazy to get this maternity coat? The model in the pic doesn't look pregnant either I have to say

Link

I found this at John Lewis & Partners. What do you think?  https://www.johnlewis.com/s-raphine-donatella-maternity-coat-black-charcoal/p4299530?size=10?tmad=c&tmcampid=7&sshare=jlappioss_Y29tLmFwcGxlLlVJS2l0LmFjdGl2aXR5LkNvcHlUb1Bhc3RlYm9hcmQ=

They run big. My guess is that it will be massive on you - I am usually a 10 and I bought a wrap coat, size 8 last year and it was really roomy, even quite late in pregnancy. Also, it was described as a wool / cashmere mix on the website. They didn’t mention the 20% polyester! I didn’t realise until I took labels off.

Thank you - probably a no go then!