Here's a quick tip for sewing facings: when joining pieces, such as at the side seams, try topstitching the seam allowances open at 3mm or 1/8". This holds them open during laundering, making ironing easier. It can also compress the seam if the fabric is bulky. And the best news is that you don't even have to underpress it - no getting up to the ironing board just to press a couple of inches!