Travelling makes you modest. It's a challenge for anyone to remain or have consistent look while travelling. You get sweat, dust mostly your clothes are exposed to outdoors.
But, there are ways to remain cool even you are travelling wearing
Jacket or blazer is a key piece that will elevate your entire look.

On my Everest Base Camp Trek: I tried casual wears
alongside the blazer. Casual could be a casual short-sleeved T-shirt or a smarter button-down shirt & scarf, it will add depth to the way you look. Of course, you will be wearing a pair of socks & trekking shoes.