Something to cover my bum, nicely

[TheHappiestCorpse]

Imagine a coat or jacket, long enough to cover my bum, and with three quarter sleeves. But it's to wear in summer, over jeans and a t shirt, so it's made of very light fabric. It doesn't need to fasten. I don't even know what this would be called ~ it's not a kimono, but along those lines. Can anyone help me, please?

I wear oversized linen shirts like this.

I got something from Primark - though at least a year ago. It’s almost a mac - khaki green with a hood and a drawstring on the waist. Sleeves can be rolled up and fastened to stay. Really lightweight

Do you mean kimono jackets like this from Zara?

https://www.zara.com/uk/en/kimono-jacket-with-metallic-thread-and-sequins-p02403980.html?v1=517577684&v2=2419006

Sezane Will jacket, pricey but worth it!