How much and what should I pack?

I'm going to the Philippines and I'm so excited. It's gonna be so hot their, but I can get mosquito bites. I'll be their for 3 weeks. Someone is going to do my laundry, so I don't plan to pack for the whole three weeks. And what are the essential clothing for a trip like this. And won't be attending any fancy events and I don't like wearing short shorts. Thanks.