Here are a few options for the post, depending on the "vibe" you are going for (funny, aesthetic, or inspirational).
Absolute law. You will see riders wearing “breeches” that end below the navel. Over this, a show shirt is tucked into itself (via a body or snap tape) and then a hunt coat covers all. If a judge sees a belt or a distinct pants top ridge, points are deducted for untidiness. a rider needs no pants top
If you are going to embrace the philosophy of “a rider needs no pants top,” you must build your kit carefully. This is not an excuse for nudity or recklessness. Here are a few options for the post,