Summarize:

While it may not be visually apparent, scent can go a long way towards developing how people perceive you. Smell nice by keeping yourself and your clothes clean, but also consider adding a perfume or cologne to your fashion line-up. Avoid young scents like fruity smells in favor of something more mature for a really classy touch. Keep your clothes in a theme in order give yourself a signature style. This is a look that people will associate with you and will make you seem more stylish, even if they don't necessarily like your clothes. The style you create for yourself should generally match who you are as a person. For example, a really sweet woman taking on a catty look will seem weird and out of place, the same as a serious businessman dressing in gangsta style. Tailor your clothes to fit your personality and people will be much more inclined to see it as your style. Do you ever feel like some models could wear a brown paper sack and still walk down a runway looking like the height of fashion? Do you know a guy who wears a tracksuit and still somehow manages to look totally fashionable? What the fashion industry doesn't want you to know is that a lot of looking stylish really comes down to projecting confidence. You don't have to actually be confident, of course, but if you walk down the street in clothes that you clearly think you look great in, people will usually be inclined to agree that (at a minimum) those clothes are perfect for you. The effortless part of the stylish look should of course be presented by giving off an air that you don't care, or that you just threw on the first outfit you could find. Be humble or indifferent when people compliment your clothes. In order to look stylish, you're also going to want to look elegant and coordinated. This means not falling down if you're wearing heels. Being graceful should be easier for guys, but is still important so don't neglect it. Even if you're wearing 4" stilettos, you need to look like it's all perfectly natural and you're perfectly comfortable. Don't complain and constantly readjust your clothes. If that style isn't working out for you, if you can't seem casual in it, then try something that's actually more comfortable. You can be comfortable and stylish. Again, effortless style is all about looking awesome while also looking like you didn't try at all. Effortless, right? So relax. Take a generally chill attitude to everything in life. Always stay calm and happy, and you'll look much better, no matter what you're wearing.
Don't neglect scent. Have a signature style. Fit your look to you. Be confident. Act like you don't care - or, actually don't care. Walk gracefully. Look comfortable, even when you're not. Relax.