Will a decent khaki suit please stand up?

After having lost close to 50lbs I no longer have clothes that fit like they should. True, I could try and pull off the good ol' college uniform, you know...button down dress shirt one size too big, baggy jeans maybe with a tear to give them that "distressed" look, and the kicker, sandals. But, lets face it, those days are long gone. I have been shopping around for a good quality suit. I have one black and one grey suit that really don't fit anymore AND the pants have about 1,000 pleats on them. Given the heat and humidity of Houston, I have been searching high and low for a good cotton khaki two botton notch lapel suit with FLAT front pants. I found a great one at my favorite store, J. Crew. (see below). I know the rule is a dark suit for an evening wedding, but when our evenings are in the lower 80's I think that can be broken. Thoughts?