Here is a seam finish that can make the inside of an unlined jacket look really beautiful. This is a technique that is found in some high end designer clothing. It is called a Hong Kong finish.
I made a jacket out of a black denim. It had quite a few white fibers in it, so I paired it with a blue/black/white rayon print which will be made into a top.
The narrow seams are now pressed with the seam allowances toward the bias strip.
The bias strip is now rolled around the raw fabric edge, and then the strips are held in place by sewing right on the seam connecting the two fabrics. This is called "stitching in the ditch".