Sorry for the late reply!
I don’t receive email notifications of activity on the thread (have changed email address in my account in the hope that it helps).
We have changed the sizing of the balmacaan this year. Last year, it came up quite large, but this year it is very true to size. Follow the size table and / or go for your « usual » size (e.g. if you are a 50 in jackets, which in the UK is called a 40, then go for a size M).
For instance, I have a chest of 40 and the size M is really my first and last option.