When you wear clothes the number one rule should be to make sure that they fit your body right. The wrong fit and even the best looking outfit will look all wrong.
Sizes in small, medium, large, extra large all have equivalent sizes in numbers as well. Translating the right size to number and number to size will help you to ensure that you pick out the best fitting garment at the store.
I wrote an article on HubPages that gives an explanation to what various sizes mean and how they translate to other ways of expressing size.
Check it out. I linked it below.
How to Get the Right Men's Sized Clothing
Please also check out my other TurtleDog posts if you get a chance. I'd appreciate it a great deal.