Go to an outfit station, on the top left you should see a drop down menu. Select "Outfit 1" and start editing. The styles available depends on the motif knowledge of all of your characters. Watch outt for the gold cost as it can add up. The cost is for editing the outfit and is only charged once you hit accept. You can also rename the outfit.
Once editing is done go to your character page and select the outfit from the drop down menu to wear it.