Not sure if this is minimalist enough for you, but I ordered this distressed leather sleeve from Etsy (ships from China) which was the look I was searching for, and the shop had great reviews. They also do free monogramming. US$62 with free shipping.
This Laptop Bags item by DMleatherStudio has 406 favorites from Etsy shoppers. Ships from China. Listed on Sep 14, 2024
www.etsy.com
Note, the shop owner just messaged me saying that the 14" fits a bit tight because of the more prominent black feet on the MBP, but said if it is, to let them know and they'd send a new one. I should be receiving mine last week of November, so will post back impressions once I get it.