Okay, so I'm going to do Ryo Akizuki from Idolm@ster Dearly Stars next year. and still I am wondering about how to do it ("All in Good Time" doesn't go with me

).
So I have this belly-free top with this shiny, sparkling material. I would say it's vinyl or something, but what I don't get:
Where to buy it from? (Please note that I need international shipping to Germany)
How to apply it on leather boots (I also need it).
Here is a reference picture:
Ref Pic (Ryo (very right-hand side) and his group)
Thank you in advance.
Kind Regards
ZeroEnna