This app was mentioned in 1 comment, with an average of 1.00 upvote
https://play.google.com/store/apps/details?id=com.mts.mysewingbox
https://blog.colettehq.com/studio/how-to-organize-a-mountain-of-sewing-patterns-with-your-phone
http://www.threadsmagazine.com/item/32129/an-app-to-track-your-sewing-projects
https://thedaringdomestic.wordpress.com/2014/02/28/how-to-create-a-sewing-pattern-inventory-database/ - another evernote one
It looks like you can use a database app, evernote, or a paid app so far as I can tell. You'd think there would be better options.