1. Create textures and shades - add tights, or a fluffy sweater, or a jeans shirt, or a mix of all of those things! Leather in general wears great when paired with interesting textures.
2. Play up the prints - go for dots, florals, stripes... Whatever you have on hand! Generally smaller prints work better, but feel free to experiment.
I made a short video explaining the outfits:
Hope you will find it useful :). Cheers!