Summertime at the beach (not ON the beach, I live AT the beach) frequently finds me in my SportKilt (Blackwatch or US Army) or my USAKilts (Celtic Nations).

The Blackwatch SportKilt is the basic (cheapest) model and is what I use for lounging around or doing yard stuff. The US Army Sportkilt has sewn-down pleats, belt loops and pockets - and is what I use for going about the neighborhood, shopping and what-have-you. The USAKilts is a step above that and I use it for everything except yard work.

All three are comfortable in warm weather. The better two actually "dress up" nicely for dinner - meaning shoes and hose. (Won't get into the kilt with sandals/flip-flops area. LOL)