Measuring Your Basket
As with anything you sew, it's important that your measurements be accurate. As the carpenters say, measure twice, cut once. Drawing a diagram and labeling it with the measurements of your basket will help you identify any possible difficulties in advance so you can plan around them. Be sure to take the measurements inside your basket.
Determine first where you want the top of your lining to be. If there is a decorative top edge on your basket, you may want the lining to attach just below it. Measure the depth in several locations, and use the deepest as your measurement. When you attach your finished lining, you can fold the top edge under a bit more to make it fit in the shallower spots.
You will need a good measurement of the circumference of your basket. This needs to be at its largest point, generally the top edge. Remember to take it inside the basket.
The dimensions and shape of the inside bottom will determine the shape of the bottom piece of lining. Taking paper slightly larger than the bottom and pressing it into the basket, smoothing the bottom and creasing it at the side edges might give you a good pattern. Remember to add seam allowances.
Lined Baskets: You can line any size or shape of basket.
How do I know how much to allow for seams?
The standard seam allowance for garment construction is ⅝″. When you make your own pattern, ½″ is easier to figure. Straight seams can be done with ¼″. It doesn't usually matter as long as you remember what you allowed and leave enough so the seam won't pull out.