Watch Dogs 2 secret mission and outfit. There's a secret quest hidden near Fisherman's Warf. Interact with the hidden laptop and you will need to find all 10 hidden garden gnomes statues. Once you have found all 10 gnomes you pick up the entire garden gnome outfit and they'll automatically be added to your wardrobe. Timestamps of their locations in this video are:

0:05 Start Location
1:48 #1
2:19 #2
3:32 #3
3:55 #4
4:29 #5
5:31 #6
6:05 #7
6:39 #8
7:18 #9
7:50 #10
9:03 End Quest Pickup Location

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