This whole set of Junihitoe (for weddings) outfit with nagabakama was sold on JYA for some USD$3000.
The Japanese designers name this cotton yukata “Mizubenohana”
Two hangyoku, 1910 by BLUE_RUIN1 on Flickr
notice the otaiko musubi with furisode! that’s quite unusual combination
Couple’s coordination where his kimono matches her obi in a darker shade.