The dress code in Marbella, Panama City, Panama, includes mainly jeans and casual tops. Panamanians like to dress nicely. In the Marbella and Panama City area not many shorts and flip flops are worn. In the evening jeans, dresses, skirts and polo shirts for men is what is mostly worn.
There are some places like churches and theaters where wearing shorts or sleeveless shirts is not well seen.
If you are going to a public office, for example to renew your drivers license, the dress code is a top with sleeves. No flip flops, no shorts.