The creative mind behind Amsterdam-based Suitsupply rose through the fashion ranks under the esteemed eye of Brunello Cucinelli, but he may be the only designer who'll share a PBR and pickleback shot with you (he swears by the Recession Specialist at NYC's Fatty Crab). Here, de Gruiter shares his tips for suiting up.
1. I'm really excited about double-breasted suits for fall. Not the kind your dad used to wear—the new ones are slim, short, and have a wide lapel and soft shoulder.
2. A lot of guys don't wear ties anymore, but a pocket square can change your whole look. If you have a black tie event, wear a white pocket square. If it's casual Friday, play with some color.
3. I always wear a white shirt, but I build around it so it doesn't look like I'm wearing a white shirt anymore. I'll add a cardigan, tie, socks, shoes, belt—they can change your look from business to casual.
4. Never mix more than two or three colors together.
5. The best suit to travel with is one that has a soft-constructed shoulder and high-twist yarn. You can fold it up, put it in your suitcase, and still walk off the plane looking good.
6. You can dress nicely and not break the bank, but always stick with quality garments. Make sure nothing is fused and everything is hand sewn.
7. Never wear an outfit that's louder than your personality. Sort of like a girl who wears high heels but isn't used to them, you can spot someone who's uncomfortable in what they're wearing from across the room.
8. Fit is key. You can buy a $5,000 suit, but if it doesn't fit well, it still looks drab. Every man should know his right size.
9. I'm inspired by old interior fabrics from Palm Springs in the '60s, and like to reinterpret them in blends like wool and cashmere. It looks structured from far away but if you touch the jacket it feels like butter.
10. I use Mr. Maroosh shaving cream with a pony hair brush every morning, and afterwards I put on this Proraso cream with eucalyptus and mint. It takes a little longer but it feels good, and your face will feel softer than anything.
—Kristen Dold. Follow her on Twitter at @KristenDold.