This Yukata is as brilliant as anything Mamechiyo has done in this vein. The blue of the yukata is obviously representing water, with the Koi in a pond. The morning glory, a summer flower in the same color, but on yellow.
きものやまとオンラインショップ きもの遊び.net | 江戸小紋 洗えるプレタ着物
This is a yukata. Yukata is a casual kimono of summer.