I made a trench coat years ago. I still wear it a lot but it really needs a new lining. I’m dreaming of a colourful one, the lining I have is black and falling apart at the seams.
Last week I made a mini trench coat. Have you ever designed clothes for dolls? Its so much fun to try to translate a normal sized pattern to mini. I used this tutorial about how to draft a sloper, and also got inspiration from this post about sewing a trench coat for a doll. A sloper is a pattern that is made to exactly fit your doll, so that clothes will fit well. Its fascinating :-). Since my fox isn’t shaped like a person (well, I guess it is shaped more like a person than a fox), this means the trench coat fits the proportions of the fox.
Once I had the sloper I looked at a pattern for a trench coat and basically sketched out the pattern over the sloper, simplifying a bit as I went. I used a pattern from one of my burda magazines.