Vintage 60s/70s Mod Colorblocked Sleeveless Dress

This is a lovely vintage dress that appears to be homemade (no tags sewn inside). There are two cute faux pockets on the chest and buttons down the top half of the front. In nice condition - there is some yellowing/discoloration around the arm holes but is not noticeable except in very bright light. Because there are no tags, there is no official sizing, but I would say it is about a medium - like a 6 by today's standards.