Try smart pak pipers. Try come in lots of colors and I ride in them all summer
Kerrits ice tech tights are nice :)
I love my kingsland leggings for summer, they are very breathable and stretchy. Quality is nice, the silicone lasts long as well! And the leggings are much less expensive than breeches.
I typically use the TuffRider schooling tights, they are supe light weight and durable. my only complaint is that they don’t have belt loops, but other than that i love them!
Try Euro Star, the breeches are made of a stretchy breathable material. They're the only pair I wear during summer.