The measurement for a continuous placket is determined by the garment's opening. This measurement comprises:
The distance from the neckline or collar to the intended termination point of the placket, often mid-chest or at the wrist.
An extra 1 to 1.5 cm on each side for seams and finishing.
Therefore, the calculation is:\[\text{Placket Length} = \text{Garment Opening Length} + \text{Seam Allowances}\]This calculation ensures proper fit and facilitates ease of wear and removal.