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An excellent explanation of the FBA - By using your upper bust measurement, you will be choosing a size that fits your frame, not your fluff. The top should fit nicely around your neckline and shoulders, avoiding the droopy shoulder seam, which is common when you make a size too large. Next, you need to know your full bust measurement. The difference between your upper bust and your full bust measurement is the amount that you need to add to your pattern.
Free download: Super Cute Pattern Making Measurement Chart: Keyka Lou Patterns shares a downloadable worksheet on her blog so you can keep your measurements handy. Just take a tape measure and fill in all the blanks with your various measurements, and you’ll have all the information you need for your next garment sewing project. And because all practial things can be made pretty, it features a super cute paper doll illustration