I agree with Sart’s commentary, but it is also reminiscent of wearing a vest/waist coat underneat your jacket. I’ve always liked the double breasted waist coat under the single breasted suit jacket. Part of the interest is that in this case, the waist coat matches the trousers and it is the upper layer that makes the contrast. Very cool look. Full of personality and confidence.
It is a very interesting concept! I think sometimes layering in the winter can get boring or sometimes I feel like I’m wearing my same winter coat non-stop. This seems like a great option to switch it up and wear lighter coats while not freezing your butt off!