Grandmacore or grannycore refers to stereotypical grandmother fashion and related things like knitting, crocheting, gardening, sewing, etc.

 Think of anything your grandmother would wear.  Grandmacore focuses on the 1970s-1990s retro styles for older women during that time. 

 Grandmacore is like cottagecore but older and more retro. You’ll see elaborate chunky knit sweaters, floral patterns, knits, chunky and gaudy accessories, etc.

 You might use these hashtags: #grandmacore #grandma #grannycore #grandparentcore #knit #chukyknit #crochet #cottagecore #flowercore #vintage #retro