I wear panties and deal with it. If someone wants to stare at my backside that much such that they are offended I am wearing underwear that is more their problem than mine.
Obviously do not wear breaches that are skin tight so the stitching in your underwear is obvious. And do not wear underwear that are so tight they are cutting you in half.
I am sure if you googled some hunter/jumper pictures you are bound to find some, geez.
I wear a pair of those shorts style ones that look kind of like a boxer brief but for women (dunno what they are called for us :p ), seems to work well, but it also helps that I prefer my breeches to be a bit on the baggy side.