Leather that has a shine to it is usually pigmented leather, meaning the material is top-grain leather with pigment and a clear topcoat applied. Pigmented leather with a clear topcoat is the most resistant to stains and the easiest to clean of all the leather fabrics used for clothing, but over time, the leather can lose its shine and grow dull. To restore the shine to a leather coat, try a simple home remedy.
Pour 1/4 cup dishwashing liquid into a plastic container. Add 4 cups of warm water to the dishwashing liquid and stir the liquid to create suds.
Dampen a soft cloth with the cleaning mixture and wipe the leather to remove dust and dirt.
Rinse the cleaner from the leather with a damp sponge and towel dry the jacket.
Mix 1/4 cup white vinegar and 1/2 cup Neat's-foot oil or linseed oil in a plastic container.
Dip a white lint-free cloth in the conditioner and apply it to the leather. Allow the conditioner to sit overnight.
Buff the conditioner with a lint-free cloth to create a high shine.
If you do not wish to mix your own leather conditioner, commercial leather conditioning products are available that contain oils similar to those recommended in the article.