Make sure your collars turn out perfectly so if they were judged by Patrick and Esme they’ll pass with flying colours!
Cut two collar pieces and interface one of them which will be the upper collar. Cut the other one which will be the under collar slightly smaller by 2mm around the outer edge.
Once sewn together around the outer edge, trim seam allowance to 6mm, also clipping diagonally into the seam allowance at the curves – this will help it lay flat and smoothly when turned through.
Use a point turner to push out the curves/corners smoothly. Roll the seam so that it sits slightly to the under collar side.
If you are working with a fabric that has a ‘pile’ or surface texture such as corduroy, make sure all pieces are laid on the fabric in the same direction, top to toe so that the pile runs the same way (Often with a pile fabric, if brushed one way it will be rough and dark, brushed the other way smooth and light).