Slouchy shoulder bag. By Anne Williams. A casual shoulder bag perfect for days out and about. Handy hint If you would like longer straps so you can wear the bag crossed over the body, replace the fat quarters with 30cm (3⁄8yd) lengths of fabric. Lengthen at the wide (3in) end of the strap by adding a 3in wide 'strip' until the strap is the length of your choice (plus seam allowances). Click on the picture for the rest of the feature.