I would recommend packing pants (any kind) or activewear instead because it will keep you cooler. Shorts or skirts would be the best option. Do note that you will likely need to wear pants when you go to Nuwara Eliya or Ella – Sri Lankas Hill Country – as it is significantly colder than the coast.
What should I wear in Sri Lanka?
Shorts, sundresses, and tank tops are suggested near the tourist streets. As you go on the main road try to cover up slightly more but you wont get hassled if you wear a dress or shorts. Add a a cardigan, hoodie, or light jacket to your Sri Lanka packing list to wear for the evenings.
Are mosquitoes bad in Sri Lanka?
We did encounter mosquitos in some locations at night but no worse than anywhere. I also live in a climate similar to Sri Lanka and have encountered dengue outbreaks so I took no more precautions than I would at home. If there is a dengue outbreak it would be quite isolated and word will get around.