A while back I posted a thread on old clothes
I have worn these on many, many trips. Over the years I have collected at least a dozen pair Ex Officio shirts and pants, when they were on sale. The problem is that the first pair are still in excellent condition. So I quit buying them because I will die before I wear out my inventory.
A couple years ago I bought two pair of their boxer briefs for backpacking trips. I was going to buy more, but then figured they weren't going to wear out anyway.
Nowadays I normally wear a T shirt and shorts, rail rider Eco Mesh shirt and pants, or Mountain Hardware Canyon Pants on trips. Nothing wrong with the Ex Officio, but these other options I like better.
But the Ex Officio items are great for travel when I need to wear business casual. Easy to wash in a hotel and they drip dry overnight without any wrinkles... so they have gotten a lot of use. I also wear them around town and to social functions when the ball and chain won't let me wear T Shirt, shorts, and flip flops :(