The correct answer is "adjusts". When a tailor adjusts a jacket, they make alterations to ensure that it fits perfectly. This may involve taking in or letting out seams, shortening or lengthening sleeves, or adjusting the shoulders or waist. The tailor will carefully examine the jacket and make precise adjustments to ensure that it fits the wearer's body shape and size. By adjusting the jacket, the tailor can make it look and feel like it was custom-made for the wearer.