To measure your neck’s circumference, find the spot on your neck that corresponds to the collar. Keep your head in a natural and level position while sliding the tape measure around your neck just below the Adam’s apple. The measurement should be comfortable but snug. Hold one finger under the tape to allow for breathing room.
To measure the shoulder and sleeve length, start by standing straight and relaxed with arms hanging comfortably at sides. Then, find the bump of the topmost vertebra and begin measuring from the center back of the neck, over the shoulder and down the length of the outer arm. Take the measurement down to the meatiest part of the hand.
Take a measurement of both arms and find an average of the two. Leave a note on your garment of the total length you’d like the shoulders and sleeves to measure.