Should I bring a heavy jacket?

Only if you plan on visiting high-altitude regions or volcanic peaks. Otherwise, a thin, breathable rain shell is sufficient for the occasional monsoon shower.

How many outfits do I really need?

Pack for one week. Tropical climates make hand-washing and air-drying laundry very efficient, so you don't need to carry more than 7 days of clothing.

How to Dress for Backpacking in Tropical Climates

Stick to lightweight, moisture-wicking synthetic or natural linen fabrics that dry quickly in high humidity. Focus on a versatile layering system that protects you from the sun and insects while keeping you cool enough to move.

Select the right base materials. Avoid heavy cotton. Choose merino wool, linen, or technical polyester blends. These fabrics pull sweat away from your skin and won't feel like a wet towel after ten minutes of walking.
Prioritize coverage over skin exposure. While it seems counterintuitive, lightweight long sleeves and loose trousers protect you from intense UV rays and aggressive mosquitoes. Choose loose-fitting cuts that allow airflow.
Bring two sets of shoes. One pair of breathable, quick-dry trail runners with a rugged sole, and one pair of lightweight rubber sandals (like flip-flops) for communal showers and beach days.
Focus on odor control. In tropical heat, clothes hold smells longer. Bring items that are naturally antimicrobial (like merino wool) or can be easily hand-washed in a sink and dried overnight.

Should I bring a heavy jacket?: Only if you plan on visiting high-altitude regions or volcanic peaks. Otherwise, a thin, breathable rain shell is sufficient for the occasional monsoon shower.
How many outfits do I really need?: Pack for one week. Tropical climates make hand-washing and air-drying laundry very efficient, so you don't need to carry more than 7 days of clothing.