Vintage 60s Mod bright tunic top with a large stitched collar, slit at the front and buttons.
Sleeveless top. Zipper up the back. Fabric lined.
Bright yellow, blue. Material not marked. Possibly a poly blend. Cotton lining.
The fabric pattern is Modernist geometric & swirl.
Wear over pants, shorts, skirt.  This may have been part of a set at one time.