I also am interested in which brands and fabrics work well for travel and are truly somewhat "breathable" , also sometimes need the serious sun-blocking and there are better and worse-feeling fabrics there, too.
Alas, my travel plans are on hold as are those of many, but after traveling to see my DD and grandkids a few times before I retired. I realized that I would do better with a curated, identifiable travel capsule ( and seasonal variations thereof). I am not wedded to technical fabrics only--instead I have been identifying several types of fabrics and garments that just perform well for various reasons. These issues include need for some zipper pockets for security, "wardrobe malfunction-proof" fits and lengths, layers for changing temps during the day.
And especially now that I am retired, I have plans for overlap with items I might wear every week--one reason is so that I don't just have a group of clothes going unused for 6 months and then go," uh oh, these don't fit". But also, I will clearly gravitate toward move movement, stretch, flat footwear and hope to run a smaller wardrobe overall. And any family that I might get to visit in the future are very casual folks, also some are "sporty", and so I fit in better wearing things that look casual, washable, everyday.
That doesn't keep me from trying to find the most flattering fits and colors, though!