Rule one: find the bridge
Two fragrances get along when they overlap somewhere — a note that appears in both pyramids works like a hinge. So read the two pyramids side by side first and look for the shared ingredient.
An example from the Wyld Notes launch range, strictly by the official notes: Black Book and Sweet Decadence share the tonka bean in their base — across that warm bridge, the spices of one and the vanilla of the other can meet. And Smokey Ember shares juniper with Black Book — a dry, fresh bridge between forest and spice. Whether you like the result is for your nose to decide; that it will not clash is what the pyramid tells you.
Rule two: the quieter one first
Apply the more restrained, skin-close fragrance first and the more present one on top — otherwise the loud one drowns out the quiet one from the first minute. As a rule of thumb from the pyramid: a fragrance with a heavy base of resins, vanilla or tonka will assert itself; a citrus-herbal one will go under if it sits at the bottom.
An alternative for the cautious: wear the two fragrances not on top of each other but side by side — one on the wrist, one at the neck. The air blends them more gently than your skin does.
Rule three: less is more
With layering, the dose doubles quickly — what was subtle on its own becomes loud when worn together. So halve the amount you would use of each fragrance alone: one spray each rather than two. Adding is always possible; taking away is not.
The official pair
That combining is no rule-break is shown by the maker itself: Wyld Notes sells Black Book and White Lie in its US shop as a duo named His & Hers — expressly without assigned roles, as two poles that belong together. Read by the pyramids, the pair makes sense: the powdery blossom of one, the spiced resin of the other, and plenty of room in between. Whether the duo will be offered in Europe has not been announced yet.
Where to start
If layering is new to you: take a fragrance you know well and give it a partner meant to strengthen exactly ONE facet — more warmth, more freshness, more sweetness. Find the bridge in the pyramids, apply the quieter one first, dose sparingly. And keep notes: which combination on which day — a field notebook, in other words. The best pairings are not found on the first evening.