Similarity is based on note and accord overlap, not molecular analysis.
Differences come from accords and community votes on longevity and sillage.
The main accords of Eau de Grey Flannel are woody and aromatic. It opens with Cypress and Lemon, reveals Lavender and Eucalyptus at its heart, and dries down to Sandalwood and Vetiver. It lasts a moderate time and projects moderately; people reach for it in spring and summer, mostly by day.
How a perfume unfolds →