Don't wear one color or same tone all at once... Brothers do this too...
Separate your clothes into dark and light colors, and then match them up... Like white shirt with dark jeans, or black shirt with light colored jacket, etc...
When getting dressed up, either match your shoes with your shirt or belt.
Also, don't wear wifebeaters and shirts under dress shirts.
And more than 2 buttons undone at the top is gay.
Do get one or two cool accessories that stand out, but Don't try to make the whole oufit stand out. (to brothers)