That's part of the reason I asked! LOL
Today I wore DH to work, then when I got home refreshed it with DHI for the evening.
I was also wondering about trying DH original + DH reformulated for just during day, instead of DH reform + DHI. This way get the iris heavy original DH plus the better longevity of reformulated DH.
So many DH/DHI threads out there but not much mentioned about layering.
DH original: Great iris effect but poor longevity.
DH reform: Less iris but better longevity vs. DH original.
DHI (both): Less iris but more cocoa, better longevity vs DH (original in particular).
Seems combining would allow to get best of each scent.