I found a pattern for this jacket in the June issue of the Finnish Käsitöitä magazine from 1901. I fell in love with it and wanted not only to make the jacket for myself but to make the pattern available for everyone. (The copyright has long gone but the pre-cut pieces just sit in the storage of the Finnish National Library.) I digitized the pattern and made it available on my blog shop. I also made a YouTube video of the making of this jacket: 

My blog has some additional tips to the people wanting to make this jacket: https://withmyhandsdream.com/2020/06/04/the-making-of-a-tailored-1901-ja...