A: 
Obi belts do wonders to define your waist, so you can pair them with larger, more shapeless garments. Obis are a wonderful accessory for calf-length dresses, long tops, tunics and loose blouses. 

Most necklines will look good with an obi belt. Just be careful with turtlenecks/mock-turtlenecks if your top doesn’t have sleeves. Depending on how wide the obi belt is, the overall affect may or may not be slimming. 

Obi belts are worn higher up than a normal belt, and they should cinch you a little above the waist. The belt should be cinched around you, but it shouldn’t be too tight. If you can’t move freely and sit comfortably in your outfit, it’ll be obvious, and the outfit won’t look right.

Because the obi belt makes a bold statement, pair it with solid colors to heighten its appeal. Bonus points for choosing a bright solid color to pair the obi belt with—the resulting look is very modern.