That’s fantastic, thanks so much for sharing.
This is quite a difficult problem, kimono are not so forgiving in the realm of height. :/ There is a link on the main page of this blog that lists Where To Buy Kimono, but off the top of my head I know Rakuten.jp (which also has an auto-translated English site) sometimes sells yukata in L or 2L, being that many shops can keep a larger inventory if they are primarily selling online.
This page says they have “Big Size” “up to 6L”, with measurements below.
Sizing online can be difficult, but good luck! I think, slowly, shops are starting to offer kimono for women over 5 feet tall. lol