It would be nice to invent saddle bags for the horses that would allow us to carry a few more items in our inventory. This would be helpful when building properties, harvesting crops and collecting ore from the mines.
Being bags they would not have to show on the horse (so no need to remodel them), and if bags were possible could we also invent clothes made from cotton from farms? though this might require a coloured in model of the person when he wears clothes.