Look for long sleeves for sun protection, and choose fabrics that are light, fast-drying, and help regulate your temperatures (such as technical synthetics or merino wool). In warm weather, wearing cotton is fine – but it could cause discomfort or chafing if you start to perspire, as it doesn’t dry quickly when wet.
What do you wear to a tent?
Layering up can help you to stay warm and comfortable whilst sleeping in a tent. A combination of a base layer, thick fleece, and a waterproof outer layer (instead of simply water-resistant) is ideal for camping in winter. Wearing multiple layers traps the heat close to your body, insulating against the cold.