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I'm myself a backpacking /trv/ler, and I mostly stick to earth tones.
Bright colors can help being spotted in case you're searched, but earth tones help if you want to keep a low profile and avoid carrying a sign that says "I'm a tourist please rob me".
I nonetheless always carry an orange piece of fabric, which I use as a rag, just in case I need to signal my position to someone. But I keep it in my bag unless I need it.