Lululemon Gray Universal Wrap Draped Waterfall Open Front Cardigan - Size 6?

Lululemon Gray Universal Wrap Draped Waterfall Open Front Cardigan - Size 6?. Condition is Preowned. There is a repair on the right shoulder - shown in photos. Size tag has been cut, side seam to side seam measures about 20” across. Based on reviewing other listings and measurements included in those, I believe this is a size 6, but not sure. Please review photos for approximate measurements and appearance