It's a rerun of a shirt they had in the 70s, and I think it was an homage to Germany rather than Belgium, at least that's what the fans referred to it as.
On the basis that a good away kit should be absolutely disgusting, I quite like it. Same as I like ours. Home kit should be classy, away kit should be rank.
I love kits that try to be different. It is so easy to just wear what is expected, our black n green stripes is now just another kit, we are not unique for wearing fluro yellow. So well done to Birmingham.