Bra

Step 7 Sides

With the old bra on, hold up your elastic from the underwire edge around your back to the other cup edge. Pull it to a reasonable tightness. This will give you twice the length of elastic you need for the bottom of the side panels. Pin the end and the middle to get the length for each side, and attach it to the side pieces. (If the elastic isn't an inch or two shorter than the side panel, recheck the elastic measurement and the side piece pattern, as one of them is wrong).

The sewing technique for attaching lingerie elastic is explained in my Panties instructable, in the step about the leg elastic.

Next, sew the sides to the cups, matching top edges, similar to how you sewed the center front stay, a bit less than a quarter inch seam allowance.