Boring but practical considerations-
Will you be out in the sun? Covering up in a light fabric can actually feel cooler than bare arms. Have a hat/shaded if you will be outside for long.
Have a wrap. Depending on where you are it might be cool in the evening or really cold inside if air conditioning is high. If going anywhere tropical I cover up after dark if there are mosquitoes - something light but much more pleasant than bites, especially if there is malaria.