Here are some suggestions. These pants have a bit of stretch. theyre light weight, have zip pockets.

notice that they also have sun protection. they might be good for hiking, horse back riding. they dont convert to shorts, but they di have pockets. they have shorts made of the same material.

this is a really lightweight jacket for if it rains. waterproof and light packing.

Here we have a convertible shirt perfect for where we're going, light weight, doesnt wrinkle, sunscreen.

sun screen on the hat