Putting together a good outfit every day is...a lot of work. Having awesome casual style is a never-ending quest. The whole idea of looking put together but not like you tried too hard? It takes more effort than it looks like. But sometimes, all you need to do is to see a good outfit on someone else and make it your own. To help you on your quest, we rounded up some of the best casual style from some of the most stylish celebrity dudes out there. Here's what you can learn from them.

Go all navy for a guaranteed good look. Beckham knows a top coat pulls any outfit together, too.

See? A tailored jacket even elevates a casual hoodie, jeans, and sneakers outfit.

A statement coat over an all-black outfit is a no-brainer.

Or you can wear your fanciest jacket with an otherwise casual fit to upgrade it.

Idris is the master of simple, powerful outfits. A cream sweater, navy chinos, and polished leather boots are as easy as it gets.

And joggers, a hoodie-slash-henley, and bright white sneakers are great for lazy weekend 'fits.

Justin Theroux has very good Chelsea boot style. Exhibit A.

All black, plus a necklace and leather bomber. Sorted. (Oh, also: check the boots. Exhibit B.)

Glover also knows the power of a good necklace. It even dresses up a heather gray crew.

Swap out your standard T-shirt for a printed short-sleeve button-down layered under a sharp jacket.

A suede jacket and leather lace-ups make any outfit stand out.

Do as Jonah Hill does and get into bowling shirts.

Dad hats and camel topcoats are great for weekend wear.

White high-top sneakers make everything feel laid back.

Never underestimate the power of a transitional jacket—especially one with bold contrast cuffs.

Does he have two coats on? Sure. But one is meant for inside style and one is meant for outside.

Beckham with the very casual air tie and beanie? Killer combination.

Good casual style runs in the family. Brooklyn leans into cropped denim and high-top sneakers.

For good travel style, this is the ideal combination: Jeans, sneakers, T-shirt, and a jacket that's easy to take on and off.

Rami's printed sweater and tailored coat make his casual outfit feel a little more dressed up—without having to try too hard.

If you're an all black kind of dresser, consider adding a pair of low-key colorful sneakers.

Transition your favorite henley into the colder months by layering it under a Harrington jacket.

A very good brown leather jacket makes the most standard fit—jeans and white tee—feel personal.

Told you.

If you're feeling too casual in jeans, a pair of polished boots makes them feel more refined (but not too stuffy).

Denim jackets and moc-toe boots are cool weather staples.