To match plaids, cut single thickness, starting with the main pattern piece at center front or back, placing CF/CB centered between (NOT ON), a dominant color or line, then cut one piece at a time, using the cut out piece as a pattern piece for the next, flipping, so you get a left and right side. I draw the plaid on the pattern pieces to match at side seams and notches on sleeves. If the plaid is unbalanced, cut as for a nap. Sew with a walking foot to prevent shifting. Some pieces like pockets, yoke and collar can be cut on the bias.