Sew Magazine tweet a sewing meme of past Great British Sewing Bee (GBSB) contestant using “Pi” to make a circle skirt.
From the screenshot.
Who remembers this!? 
In light of sewing Memes, Sew Magazine reminds Sewist \ Sewers of past Great British Sewing Bee (GBSB) integrating “Pi” in making a circle skirt