If you don't own a proper suit (certainly unacceptable if you're older than 20! But I'm sure some of you out there still don't have one); No worries guys, I wont judge you and instead I will recommend you only one suit you will need. The Blue Suit! Like this Marks & Spencer Suit.
Trust me, Blue is the color that won't let you down regardless the occasion, year or season. For instance, when it's summer, I try to wear it with brown leather goods to give it a warmer look. And when it's a cooler season, I like to wear it with black leather accessories.
For a more casual look, you can wear it with sneakers or a white T-Shirt under the jacket. You will still look BOSS no matter what.
Marks & Spencer Indigo Dress Pants - Shop Herevia ShoppingLinks.com
M&S Two Button Indigo Jacket - Shop Here via ShoppingLinks.com