A Bitless attachment is the ideal way to go if you are wanting to try bitless on your horse. 

This Sidepull is designed to attach to your existing headstall and with an extra hanger, can be used in conjunction with a bit. It's the gentlest of the bitless options and is best suited the sensitive horse or a youngster just being started.

The Sidepull doesn't have any mechanical action and relies entirely on transmitting the aids via the riders hands and reins. It's fully adjustable but designed to fit snugly and the braiding is not just for decoration but the texture also helps the horse feel the aids more clearly.