Vintage 1960s -70s button up leisure shirt

1960s to '70s button up multicolor retro shirt. Doesn't have any tags. But the material is very stretchy, almost like spandex type material. shirt is very unique I've never seen anything like it on the internet. and I'm pretty sure it's a small because I tried it on and it's very tight on me and I'm a medium to a large depending on the shirt.