Sounds like riding tights are what you're looking for. Are you avoiding breeches because they feel to restrictive, or because they are tight through the calf? If it's the calf tightness, then look for boot cut tights or breeches. I just bought some kerrits riding tights (they may still be on sale at dover!) and I love them! They are cool and lightweight. Stretchy like yoga pants, but with knee patches!