The national dress of Pakistan is known as the shalwar qamiz. That's Urdu for 'a well-spangled shapeless sack over elastic waist cotton pants'. It's brilliant: flattering for all body types, appropriate for the weather, and lullingly comfortable in exactly the way that a suit is not. It goes well with the national dish, which is dark, unidentifiable meat mixed with dark, unidentifiable oil and served with a heaping of carbs; the elastic waistband can easily incorporate the cholesterol-induced swelling of your arteries.* Added bonus: if you need to wipe your food-greasy hands on your thighs, the long top is going to cover it right up.
I don't know what the diplomatic rules are about wearing your host country's national dress, but I also find that I don't particularly care what the rules are when presented with the alluring option of going to work clad in what are essentially pajamas. I bought two to start with -- paid for in cash. I didn't want to risk the embarrassment of having the store refuse my credit card now that America's S&P rating has slipped a notch.
*Or your 'New Butt', as the sweet store near the Consulate is so aptly named.