Studying up on the ingredients of gin, I created a similar gin and tonic cologne but it's quite different from the one given at the top of this thread. It uses many of the ingredients that are naturally used to give gin its characteristic flavour, such as juniper, coriander, etc. and there are no synthetics in this so you could even use it in drinks. These are given in drops and most are from 10% dilutions in alcohol.
Lemon zest squeezed over funnel, about 1.5 sq in
Pepper (black) 1
Petit Grain 2
Mandarin Green Fraction 3
This was very good, but it has almost no base, so only lasts 30 minutes. But super for first impressions and a real fresh up.