Inspired by the interest in the Ex Officio shirts at Costco for $24.99, I am going to show my favorite travel shirt, the Royal Robbins expedition stretch 3/4 sleeve:
https://www.royalrobbins.com/expedition-chill-stretch-3-4-sleeve
Before you gasp at the price, read on.
You can find these in discontinued colors and prints on Amazon for much less. I just bought one for $15.85 with free shipping (Amazon Prime). I already have three others and always take two to Europe.
They are lightweight, pack small, UPF 50, quick-dry, and very flattering. And the 3/4 sleeve style is cool on hot days. ( RR makes a long-sleeve version of you prefer that). I like that I don't have to slather sunscreen all over my arms and neck, just my lower arm and hands.
And they don't look like you are going on safari ( or fishing).