I've found many plus sized sewing patterns. I think they're standardised sizing from the 1980's, but I'm in a lot of them.

https://simplicity.com/women/plus-size-patterns/

https://fridaypatterncompany.com/

https://www.munaandbroad.com/

https://www.cashmerette.com/

https://www.stylearc.com/

https://www.burdastyle.com/sewing-patterns/plus-mode.html?p=2