Proper sleeve length is an essential element of a well-fitted shirt.
Proper fit is the most important element of any article of clothing. Regardless of price, designer or style, if clothing does not fit, it's not going to look good. Conversely, if it fits, if will flatter.
Shoulder fit
In order to have a well-fitted sleeve, the shirt sleeve should start at the right place.This means the shoulder seam should be directly above your underarm. If the shoulders are too narrow, the shirt will pull when you reach forward; this is uncomfortable as well as unattractive. If the shoulders are too wide, the shirt will bulge with excess cloth.
Sleeve length
The sleeve should end at the proper place on your arm. When standing with your arms relaxed at your sides, the end of the cuff should hit just at the wrist bone. The shirt sleeves should extend just beyond the sleeves of your jacket---about a quarter of an inch.
Comfort and range of movement
When you move your arms forward, the sleeves should not pull up more than half an inch. If they pull up more than that, the shirt does not fit properly. You should be able to move comfortably in the shirt.
Tailoring
If you find a shirt that fits well in all respects except sleeve length, you can have the shirt tailored. In this case, opt for sleeves that are a bit too long rather than too short; it's easier to shorten sleeves than lengthen them.
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