It is important to measure the high bust area snugly (like a skin measurement) to pick your proper size. If you measure loosely, your garment will be too big!
Pick Your Size: Take two bust measurements - high bust and full bust. Choose your pattern size by the high bust measurement. You may be picking a size that is smaller than normal, but you'll get a very nice fit through the shoulder and armhole areas.
High Bust - just under the shoulder blades, as high as possible under your arms, above the fullest part in the front.
Full Bust - Straight around the fullest area.
This pattern has two different Front pieces. If there is less than a 3" difference between your high bust and full bust measurement, use the basic Front pattern piece. If there is more than a 3" difference, use the Darted Front pattern piece. If you are "on the fence", try your first T-Shirt using the Darted Front, and the second using the basic Front.
Pick Your Size for the Skirts: Measure three places at your hip area: high hip (fullest part of tummy), full hip and thighs. Use the largest of these three measurements to choose your size. Ease is built into the pattern. If you are on the smaller end of a size range, you will be taking in the skirt a bit. Multi-sized patterns are based on the largest measurement in a size range.
Pick Your Size for the Pants: Measure around the Full Hip, under the tummy, keeping the tape measure parallel to the floor.