Sloppy

If you unbutton your collar, remove your tie. You can wear a suit or sports coat without a tie, but wearing a tie with an unbuttoned shirt looks sloppy.

From: lifehack.org

Good fit

The most dramatic improvement you can make in your style is to make sure everything fits impeccably.

From: kinowear.com

Sharp wardrobe

White and light blue cotton dress shirts are the backbone to a sharp wardrobe. These colors make up approximately 90% of the dress shirts sold worldwide.

From: lifehack.org

Choose clothes that are perfect for you

The right proportion and fit are a matter of centimeters – millimeters, really. When you choose clothes that are perfect for you, you feel strong, comfortable, and more self- confident.

From: fashiontofood.com

A good pair of dress shoes

A good pair of dress shoes will last you years and stay good-looking with nothing more than some light cleaning and the occasional shine.

From: realmenrealstyle.com

When to buy shoes

Shop for workout shoes late in the day. That’s when your feet are the largest. Make sure there’s a half inch of space in front of your longest toe, and that you can easily wiggle your toes.

From: menshealth.com

Short people…

Short waist men should avoid wearing trousers and jeans at waist, they tend to highlight your short waist.

From: indobase.com

Invest in a good pair of shoes

If it’s one thing that women will notice, it’s your shoes. Especially how clean they are. It’s easy to wash and press the rest of your clothes to keep them looking new, but most guys disregard their shoes.

From: careerbuilder.com

Make things fit

The most dramatic improvement you can make in your style is to make sure everything fits.

Most guys wear clothes that are too large. Make sure everything you wear is almost hugging the curves of your body – without being tight.

From: careerbuilder.com

Buttoning a jacket tip

When wearing an American-cut jacket (single-breasted), button up when standing or walking.  If your jacket has two buttons, button the top one.  If it has three, button the center one.

From: createbusinessgrowth.com

Business formal

Business formal is a subset of traditional business attire, yet, it has specific requirements just one step down from tuxedos, such as dark tailored suits for men and women.

From: casualpower.com

When in doubt, wear a tie

Ties are generally not necessary for business casual, but if you are in doubt, you can wear a tie. 

It never hurts to slightly overdress; by dressing nicely, you pay a compliment to your host

From: career.vt.edu

Business casual is classic

Business casual is crisp, neat, and should look appropriate even for a chance meeting with a CEO.

It should not look like cocktail or party or picnic attire. Avoid tight or baggy clothing; business casual is classic rather than trendy.

From: career.vt.edu

Do we have to tell you to match your socks? Maybe.

Socks should be calf-length or above. Make sure they match not only what you are wearing, but also each other.

A quick glance in good light before heading out the door can save embarrassment later in the day.

From: a-man-fashion.blogspot.com