Based on the B3-Flight Jacket f the US Army Air Corps, the jacket was originally designed as heavy-zone wear. Suitable for (-30 to -10 degree Celsius conditions). Considering the fact that it isn't this cold in Amsterdam, you can just wear it for aesthetic purposes.
Try items in the comfort of your own home. If they're not quite right, you've got 14 days to request an exchange or return and send them back to us.