Planning for unexpected weather on your trip, weather.com gives you a 10 day look so LOOK the day before you leave. Getting warm is easier than getting cooler.
Always toss in one t shirt. I love Hanes men’s tees for their 10% cotton and budget.
Long sleeved shirts that are easy to push up work.
As ugly as they are, Columbia and others make zip off pants. Pants become shorts.
In some countries go shopping: India, China and Mexico are excellent for cheap and cheerful. Don’t sweat it out,there are solutions.