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Q&A:
How do I choose a dress shirt collar?
No matter the current fashion trends, there is a right and wrong collar for your face shape. If you have a round face, select a collar that is longer in shape, such as a straight collar. To complement a long face, choose a wide collar, such as a spread or a modified-spread version. The man with prominent features should consider a more substantial collar than a fine-featured man. A high-sitting collar, such as a model with a double button at the throat, compliments a long neck, while a low-sitting collar is an appropriate fit for a short neck.
Read more at RL Style Guide