I measure the angles in a shirt’s collar, cut the hems at a 5‑degree slope so the light hits the fabric at the right place, and then use a color wheel to pick complementary hues. A small, repeated geometric motif at the cuff can draw the eye to the right spot. The key is to keep the pattern simple, the lines clean, and the color contrast precise. That’s all the math a tailor needs to make a garment speak.