|Shape the neck and armhole bands with a cardboard. This technique can be used for pockets too.
1 Cut a cardboard to a desired shape without seam allowances.
2 Place the cardboard onto the fabric.
3 Fold, press and slide the seam allowances along the cardboard sides, with a bamboo stick or any modeling stick. You should end up with creases along the seam-line of the fabric. You can skip this step if you are making a pocket. This is great to use on concave edges.
4 Clip the seam allowances.
5 Iron press the band with the cardboard inside.
6 You can make the mirror side of the band, by turning the cardboard up side down.
See the detailed pictures , with the step by step guide.