Could buy some NOS and Creatine. They give a nice pump to the muscle, although not extra muscle added they will give you a little extra volume in the muscle.
Creatine for when I do bother to use it can make some shirt get smaller.
But with a good diet and training you could definately look better come August and it's still warm then?
Otherwise wear a muscle suite? Chicks will never know!

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There's those that do, and those that don't,
Those that will, and those that won't,
Those that can, and those that can't.
..... Dont be a loser!! ....