I love my Tilley LT5 (and my LH5 and T3) hat. It fits perfectly, is well-made, is light, and looks great. However, I've found that while hiking in the sweltering summer weather here in Japan the hat just doesn't breathe well, and is too hot. I end up removing it constantly to wipe away buckets of sweat.
I decided to try to make my own version of the hat, using Schoeller material from an old pair of hiking pants. I also wanted to incorporate a stiffer brim (I also used a heavy gauge wire around the perimeter like the LT5) and use the stretch capabilities of Schoeller to be able to layer a balaclava under the hat in cold weather. What I ended up with weighs 70 grams, 25 grams lighter than the 95 gram Tilley LT5. It breathes very well, dries quickly, wicks sweat, and is relatively warm in cold weather. The brim barely budges when I push on it, in fact it "hums" from its being drum tight. An olive green polyester under brim cuts the glare. I like the grey Schoeller fabric, too. Pretty happy with what I was able to sew together, though the seams aren't perfect. Wearing it all around the house now. (^J^)