I always knew Princess Diana was cool, but seeing photos of her wearing that Warm & Wonderful black sheep jumper in 1979 made me realise just how much of a rebel she really was. Recently, the iconic knit was reissued for a collaboration between Warm & Wonderful and Rowling Blazers (£250). But even better, the original vintage knitting pattern is now available for free online as a charitable campaign to raise life-saving funds for Doctors Without Borders – we think Diana would have loved that idea.

Pennies Per Hour of Pleasure (p/hop) is a knitting fundraiser for non-profit organisation Doctors Without Borders (MSF). In an effort to raise life-saving funds for medical care in over 60 countries, p/hop collaborated with Sally Muir and Joanna Osborne (the founders of Warm & Wonderful, who changed the brand name to Muir & Osbourne in 1987) to re-release the original black sheep knitting pattern. The pattern is available for free, and knitters are encouraged to make a charitable donation to MSF while they enjoy recreating this iconic British jumper design.

Ahead, check out the knitting pattern for Princess Diana’s black sheep jumper, and similar patterns for some of the royal’s other statement ’90s knitwear.