Do I need a heavy jacket?

Only if you are planning to trek in the high mountains of Northern Vietnam or Laos in December or January. Otherwise, a light sweater for over-air-conditioned buses and planes is plenty.

How often should I do laundry?

Every 5 to 7 days. Because of the heat, you will sweat through your clothes daily. Drop them at a local shop in the morning and pick them up clean and folded the next day.

Are shorts okay to wear?

Shorts are fine for streets and beaches, but they are generally frowned upon in government buildings and rural villages. Keep one pair of lightweight trousers in your bag for those moments.

Packing the right clothes for Southeast Asia

Focus on lightweight, moisture-wicking fabrics that cover your shoulders and knees for temple visits. Pack for one week of laundry, as wash-and-fold services are available on every corner for under $2 per kilogram.

Select the right fabric. Stick to linen, light cotton, or technical synthetic blends. Avoid denim or heavy cotton, as they take days to dry in the high humidity and will trap heat against your skin.
Master the modest layer. Carry one lightweight sarong or a loose linen shirt in your day bag. You need to cover your shoulders and knees to enter most major temples; these items are easy to throw on over your outfit and pull off when you leave.
Plan for the footwear swap. Bring one pair of comfortable walking sandals (like Teva or Chaco) and one pair of breathable sneakers. You will be taking your shoes off constantly to enter homes, shops, and temples; avoid shoes with complex laces.
Pack a light rain shell. Southeast Asia has sudden, heavy downpours regardless of the season. Pack a packable, non-insulated rain shell that folds into its own pocket. Avoid thick rain jackets, as you will sweat through them immediately.

Do I need a heavy jacket?: Only if you are planning to trek in the high mountains of Northern Vietnam or Laos in December or January. Otherwise, a light sweater for over-air-conditioned buses and planes is plenty.
How often should I do laundry?: Every 5 to 7 days. Because of the heat, you will sweat through your clothes daily. Drop them at a local shop in the morning and pick them up clean and folded the next day.
Are shorts okay to wear?: Shorts are fine for streets and beaches, but they are generally frowned upon in government buildings and rural villages. Keep one pair of lightweight trousers in your bag for those moments.