I'm new here, so hope it's helpful to revive an older thread. Thanks for those suggestions. I do think that one problem with plus size patterns is that, even more than smaller sewers, weight & size distribution is variable. Some are drafted more for big busts than big bums etc. etc. Here are my favourites:
Cashmerette indeed, although I find some patterns over-complicated. Jenny make things clear and displays the clothes both beautifully and realistically.
Ready to Sew have gorgeous clothes that drape well on me.
Muna and Broad are quite eccentric! They don't use models. Their leggings are quite brilliant, work better than any others for me, and I have made their oversize shirts in linen for summer.
Folkwear are not specifically for plus size women, but the kind of patterns they have are very adaptable, and beautiful. I used their Pioneer dress pattern for my maternity smocks (and my youngest child is 40 next month!)
Most of the patterns in Tauko are sized for larger people, and are adapatable. The magazine is available from The Fold Line