Horses with stripes
How to get stripes on horses.
Use these breeds. Remember that the resulting breed should NOT be zony, zorse, zarger, mule or hinny which are sterile.

Use winged zebra with winged horses.

Use horned zebra with horned horses.

Use rainbow zebra with bat wing horses.

The only regular horse that can have stripes by breeding would be a charger by breeding first a horned charger to a horned zebra or a winged charger to a winged zebra and the foal to a charger.
The gene to express stripes is TG.