Olivium Outlet Center
From Taksim, take funicular to Kabatas, and the tram from Kabatas to Sirkeci. At Sirkeci board the suburban train and get off at Kazlicesme stop. Walk towards the stadium and when you go past the stadium, Olivium Mall is there.
Optimum Outlet
Get on Metro from Taxim to katabas (1 stop ) then the ferry from katabas to Kadikoy then the metro to Yani sahara stop and then walk almost 5 minutes from the metro stop