Hear ye, dressmakers of Australia.
I know many of you don't like Spotlight very much. A lot of the time I agree with you. It's certainly no substitute for the many Little Fabric Shops that have gone under from financial pressures.
But I'm here to tell you, they have the BEST product I have ever found for dressmaking toiles: Trace and Toile Interfacing.
You trace the pattern on to the interfacing. Then you cut out the pattern pieces in the interfacing, and sew up the garment in the interfacing (using a good big stitch). Try it on. If you need adjustments, you mark it on the toile - which means you are marking it directly on the pattern! Unpick the seams at the end, and voila, you have a pattern already altered to fit.
I found it pins and sews beautifully, without tearing or stretching, and isn't too stiff when fitting it on the body. This is definitely one product I'll be keeping around.
*This is a completely gratuitous recommendation of a product. Spotlight have not given me any incentives to write this entry. However if they would like to send me free stuff or filthy lucre they are welcome to.