So you're in with TechCrunch, have 500+ connections on LinkedIn and are getting cash from Sequoia Capital. The thing is, you're still rolling into work in ill-fitting jeans. 

Last year, our little Mark Zuckerberg was listed among Esquire's top 10 worst dressed list in The 2010 Celebrity Hall of Shame. Zuck shares the bi-winning honor with none other than Charlie Sheen. Yikes.

Inspired by Zuck's worst dressed profile, the stylists at Tobi decided to take action with their CEO Style Guide. Armed with cardigans, fitted shirts, and boat shoes, Tobi went deep into the trenches of Silicon Valley, dug out six lucky CEOs and gave them one heckuva makeover. Check out these six newly made men, geeking out on good style.

1. Rick Marini, founder and CEO of BranchOut.

"At a higher level, especially with CEOs, style matters. It would be nice if it trickled down."

2. Tim Ferriss, author of The 4 Hour Work Week and The 4 Hour Body.

"Defining what style means for you is important. Finding your own particular aesthetic is important." 

3. Kamal Ravikant, CEO of Revnetics.

"[Style] didn't matter to me for a long time, but once you get it, it's a game changer. You feel better about yourself and women like you better."

4. Alex Rampell, Co-founder and CEO of TrialPay.

"If you're a true entrepreneur style probably doesn't matter that much. It's the opposite of the East Coast, where it's all about jackets and ties -- very, very formal. Here it's more about substance over style." 

5. Naval Ravikant, co-author of Venture Hacks and co-creator of AngelList.

"It's almost a mark in Silicone Valley of how little you care about your style because if you care too much it implies that you're not working hard enough."

6. Greg Tseng, Co-founder and CEO of Tagged.

"Previously I was just dressed like everyone else in sv, wearing jeans and t-shirts."

Check out this video for the making-of Tobi's CEO Style Guide, directed by Scott Hammel: 

CEO Style Guide from tobiTV on Vimeo.

Lily Ko (lily.7x7 @ gmail.com) studied fashion design and merchandising at Central Saint Martins and the Academy of Art University. Lily has a rich beauty background, with experience as a salon product tester and hair model. In addition to writing for 7x7, Lily is an editor at SF Station, writes for Culinary Trends Magazine, and works as a freelance stylist.