Darker suits work better rather than light ones. You can try suits that come in navy blue and charcoal colors like gray. Wearing black suits, on the other hand, may seem too serious as if you're attending a funeral. Prepare more quality suits that you can mix and match. You may also go for long-sleeved button-down polo in white or pale colors. If you don't want color blocking, stripes are alright but avoid the ones with wild prints or patterns on them. Keep in mind that you want to look professional. Make sure that at least one inch of the sleeve peek out from under the suit jacket whenever you wear it. And the suit is dry cleaned and ironed well.
Consider your ties. Your best bet is the ones that are made of silk. Whatever your style is, never ever wear a tie that have cartoon character prints on them.
Match your socks with your pants and shoes. So you better stock up on blue, black, gray and brown socks. Avoid showing some skin when you cross your legs by choosing a pair that is long enough.
Prepare your shoes. It is a tell-tale sign of how clean and organized you are as a person that you even take your time cleaning your shoes. Avoid looking too casual. One thing to check, too, is the soles. Make sure that they aren't worn out. If they are, head to the local shoe repair shop.
Don't overdo your accessory. Don't wear flashy accessories. Go for plain and simple watches instead of those ones with blinding diamonds. Leather belts that complement your shoes are a good choice. Last but not the least, if you have to bring a briefcase to complete your look, go for the ones that come in neutral colors that will complement most of your suits.
A person can already make his judgment on your total physical appearance and first impressions last. In this case, you are marketing yourself as the product. So if this is your first job interview, you just have to dress to impress.