Have you ever tried to iron a curved seam on a flat ironing board? If the answer is yes, then you know how difficult it is to maneuver your iron plate along this organic shape when working on a flat surface. Luckily, there is something called a tailor's ham and it serves as an invaluable tool when ironing curved edges and irregular seams.
A tailor's ham is an oval, semi-soft, three dimensional shape that molds to curved seams and edges in the ironing process. Conventionally, a tailor's ham is lined with wool on one side and a plain cotton (twill) layer on the other. The wool surface holds steam providing a more effective ironing process and result.
To iron a curved seam using a tailor's ham, simply place the curved/organic seam over the tailor's ham such that the two curved shapes mold to one another with the seam remaining flat in the ironing process. Keep shifting the curved seam along the tailor's ham for optimal comfort in the ironing process.