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Collar Size
Measure around your neck at the base, where your collar naturally sits. Add half an inch for comfort. This measurement should allow you to comfortably fit one finger between your neck and the collar when buttoned.
Chest Measurement
Measure around the fullest part of your chest, keeping the tape measure parallel to the floor. This helps determine the appropriate body width for your chosen fit.
Sleeve Length
With your arm slightly bent, measure from the center of your back neck, over your shoulder, and down to your wrist bone. The ideal sleeve length allows approximately half an inch of shirt cuff to show beyond your jacket sleeve.