The weather is tricky, so a thick outer feels burdensome. Is there a functional single-layer jacket that's light to wear?

I picked two nylon safari jackets made as a single layer without lining and finished with water repellency. They can be lightly thrown on, and you can adjust the silhouette using the inner waist string and sleeve cuff buttons. They are available in two colors: Black and Olive.

I picked the functional single-layer safari jacket in Black that you mentioned. Made of Japanese nylon fabric with a water-repellent finish, it lightly keeps off rain, and being an unlined single layer, it is great to throw on during in-between seasons. You can easily adjust the silhouette with the sleeve cuff buttons and inner waist string.

Dry cleaning is recommended, and when washing, separate washing is required. Use of bleach and dryers, as well as spot cleaning, are prohibited. Due to the nature of yarn dyeing, color transfer may occur, so please be careful not to wash it with light-colored clothes.