For example, if the elastic is part of a waistband, then measure around the person’s waist. Use this measurement to figure out how much elastic you will need for the waistband, and cut the elastic to this length. If the person wants the elastic to fit snugly, then subtract some length from the measurement. For example, if the person wants a somewhat snug waistband, then subtract 2 inches (5. 1 cm) to 4 inches (10 cm) from the waist measurement and cut the elastic to this length. [2] X Research source
Another option is to sew the ends of the elastic together using a scrap piece of fabric. Line up the edges of the elastic over the scrap piece of fabric and then sew a zigzag stitch across the edges 2 or 3 times. This will eliminate any bulging that may occur from overlapping the elastic. [3] X Research source
Make sure that the edge of the elastic is about 0. 25 inches (0. 64 cm) from the edge of the fabric. This will ensure that the elastic will be hidden when you sew the elastic in place.
For example, if you determined that you need 1 inch (2. 5 cm) of fabric to create a casing for the elastic, then fold over 1 inch (2. 5 cm) of fabric towards the inside of your garment.
Make sure the opening is wide enough to easily slide the elastic into. For example, if your elastic is 0. 5 inches (1. 3 cm), then your opening should be about 0. 75 inches (1. 9 cm) to 1 inch (2. 5 cm) wide.
Make sure to avoid sewing over the area where you have marked as the opening for the casing.
For example, if the elastic is part of a shirt cuff, then measure around the person’s wrist or arm where the elastic will go. Use this measurement to determine how much elastic you will need, and cut the elastic to this length. Depending on how tight the person wants the elastic to be, you may need to subtract some length from the measurement. For example, if the person wants to ensure that the cuffs on the garment stay put, then you might subtract 0. 5 inches (1. 3 cm) from the wrist measurement to ensure a snug fit.
Make sure that you do not insert the safety pin through the elastic too close to the edge of the elastic or it may come out while you are working the safety pin through the casing. Insert the pin about 0. 5 inches (1. 3 cm) from the end of the elastic. [4] X Research source
Be careful not to twist the elastic as you work it through the casing. If the safety pin opens while you are working it through the elastic, try to close it through the fabric. If you cannot get it closed, pull the elastic and safety pin out of the casing and secure the safety pin again. Then, reinsert the safety pin through the casing opening and try to work it through again. [6] X Research source
If you are having trouble holding onto the other end of the elastic as you work, then you may also attach this end to the outside of the casing with another safety pin.
