Final answer:
The best tool for adding a cutting allowance to a pajama pattern is a tape measure, due to its flexibility and ability to measure in various units.
Step-by-step explanation:
The student is asking which tool would be suitable for adding a cutting allowance to a pajama pattern that Gerald Roberts has already finished. The appropriate tool for this task is the tape measure. A tape measure is flexible and versatile, with different units of measurement, making it great for adding allowances to patterns. Although seam gauges, pins, and rulers can be helpful in sewing and pattern making, the tape measure is best for measuring lengths such as the cutting allowance on a fabric. Erin, as an example, chooses a tape measure at the hardware store for its flexibility and versatility in measuring for redecoration purposes, which shows that the tape measure is ideal for tasks that require measurements in feet, yards, or meters.