Even though you won't be wearing it long, it generally is a better idea to buy a suit than rent one, because rentals never fit properly and generally look cheaper. Choose a suit made of weighty, quality wool, and absolutely opt for a tailor.
Now You Own It, So Wear It
Remove the vest and add a red, purple, or light-blue tie, and you'll have yourself a sharp new suit to integrate into your work wardrobe. On the weekend, you can rock the vest with a fitted t-shirt and dark wash jeans. The jacket, obviously, will work as a blazer, but you can also wear the pants on their own.
Remember: buy, don't rent. You won't regret it. And while you're thinking about buying, be sure to check out our Father's Day Sale. Our entire store is 20% off!