This is a great book on plus sized sewing. It's got everything from design, through pattern alteration and fitting! The author herself is very plus sized, so she knows what she's talking about. I got it at Amazon used for about $8. One thing I like is it's got outlines of different plus sized shapes you can copy and draw over to see if a style will look good on your figure type. Check it out:
www.amazon.com/gp/product...698-7228602
www.amazon.com/gp/product...698-7228602
