Hipster to me is when someone likes to do things vintage, and the music they listen to is different from the ones you hear on the radio. And their way of fashion is plain but it's also stylish. You'll probably catch one wearing a a plain white V-neck with worn out jeans, and tan desert boots. Some also wear glasses -- mainly circular ones. By their side, you will see a leather or cloth messenger bag wrapped around their body.
There's always that one guy... you see him in the coffee shop with his laptop and a notebook open, drinking a latte or something. You'll probably think that he's cute, or romantic, maybe he writes poems. Their age might be around 20-27 years old. I like to call those guys "Hipsters".
Here are some examples of what I think Hipster guys dress like. Get Inspired.