There were plenty of twenty-somethings just all looking to have a good time. Obviously everyone wants to let loose and drink the night away, but there are still ways to get your drink on without looking like a sloppy mess.
After you've cleaned up, start getting yourself ready. Do not just put water on your hands and rub them through your hair. You might think you don't smell, but you do.
SHOWER! SHAVE! WASH BEHIND YOUR EARS!
When you get out of the shower, under no circumstances should you EVER douse yourself in Axe or any cologne for that matter. De-od in your pits and you cologne a little spritz. It doesn't need to be across your whole chest. Spray some in your hands and dab the cologne on the parts of your body that emit the most heat: nape of your neck, wrists, behind your ears and a little on your chest.
Comb your hair away from your face, use whatever product you are comfortable with and run a hair dryer through it.
Getting dressed is not as hard as you think. Start at the bottom. I suggest a dark denim or black pant. Boot cut or slim leg. A slim fitting khaki is also good. Pretty basic, right? Also no crazy embellishments or embroidery on your pants or butt pockets. It's awkward.
Invest in a good belt while your at it.
Tanner Goods
Makr
Billy Kirk
If you're old enough to go to a bar, you are old enough to dress like an adult. Leave the graphic t-shirs at home and throw on something chic and simple. I'm all about brand support but it's distracting and not for a night out. (If you really, really, REALLY want to sport a graphic t/sweater just make sure it works with your look.) A henley always look good, even a plain t shirt. You can never go wrong with a classic button down. You don't need to layer a t-shirt under your button down. Generally guys do this if they sweat a lot to absorb their perspiration, but I think you'll just be hotter. Try a lightweight cotton, your body will be able to breathe.
Throw on a nice blazer, coat, leather jacket, or a sweater and be on your way.
The following is a list of a few brands that have some basic/essential piece.
Raleigh Denim (Linked an amazing video with it!)
Wings + Horns
Twothirds
Simon Miller
Save Khaki
Engineered Garments (For the more ambitious)
Steven Alan
S.N.S Herning
Velva Sheen
York Street by J.Press
Be confident, not cocky and just have a good time.