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I made it longer than necessary so I could fold it up to the desired length like you would on a kimono. I made the obi out of fabric and very stiff interface. I decided to shortcut the obi method and made a Velcro closure in the back (as opposed to the normal length of an obi which is much longer). I used a tail key chain I had laying around. It's not completely accurate to the reference but it still looked cute. The bow was made extra large and supported by wires. I also made a pillow-like cushion for added support, and because I saw a peek of one in the reference figure.
Here is a picture of the eri sugata I made:
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It has interface on the inside for stiffness. I sewed elastic to the ends and to the back piece so that I could wrap it around and tie it below the bust.
I also made her plug clips. I started with an aluminum foil ball, then covered it in red Sculpey. I carved the black detail with the end of a paintbrush, and baked it with the hair clip on the bottom.
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This is after they were baked, sanded, painted, and varnished.
I couldn't find any tabi socks that matched the color of the yukata, so I made some. These are made from a stretch cotton jersey:
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The finished look courtesy of WinterWish cosplay photography:
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Note to self: look into getting a new wig and fix makeup -_-