Mix scents. Stratify. Layer. Well, I'm sure you got the point: applying two or more fragrances at the same time.
For scent purists, the habit of layering is tantamount to blasphemy: fragrances are born with an intention and have their own voice, which tells a well-defined story. How do you layer different voices and stories without completely ruining not a single perfume at a time, but two?
You do, you do it. Sure, it takes a bit of creativity, some courage and a pretty sure taste, because the risk of composing an unbreathable mix is just around the corner. I personally have never done it, the only thing that I do mix are my musk scents with a few simple fragrances, to give them base, structure and length thickness. In the end, I guess I'm a purist. But certainly not a Taliban, and then I'm curious to discover what others are doing.
Many began layering by happy chance: they don't remember they're already wearing a perfume and go to try another, then they realize that the mix of the two really works. Or, they spray perfume on a shirt where there was still very much the scent of the day before, and the two make an interesting mix.
Other people layer because they are tired of a certain scent and no longer want to wear it alone, but have found out that wearing it with something else, the whole is more pleasant and worthy of being worn.
But ... what can we mix?
It 's generally good to layer fragrances that develop linearly, without too many facets and secondary paths, as well as fragrances dominated almost entirely by a single note or accord: try a musk and a rose, a citrus accord and a flower ... the important thing is that fragrances share a short formula.
Or, you can layer a scent that you like with a soliflore or with a single drop of essential oil, in order to strengthen that part of the perfume you like but but maybe doesn't live enough or doesn't play loud enough for your tastes. For example, try to reinforce a perfume with a lavender soliflore or with a drop of lavender, rose or patchouli and see if it stretches out over time, or simply it sounds louder.
A cute little game is to find two fragrances sharing a lot of notes, or share the same theme -even played in different ways- (like two orientals, two green spring-y, two floral aldehydic), and try layering them to see what happens.
Another interesting game, but it takes a little more awareness, is to try to understand what section of the fragrance you do not like -the head, the heart, the bottom- and use another scent to "cover" it: for example, if the perfume that you like has a top accord you don't like, try to layer it with a citrus or aromatic cologne, which will fade as soon as the other perfume will be expressing its middle accord.
The reverse is not very simple game: rather than try to cover base notes you do not like with something else (very difficult), you can try to complement it with another fragrance featuring a "strong" base accord, so that the two bases will entertwine creating something different. I would spray the perfume with the best base accord first, so when the other will reach the base accord, too, you'll only perceive the mix.