To unlock the Dress to Impress trophy in The Division 2, you will need to equip a Rare (yellow) item in each of your gear slots.
The slots needs are:
- Primary Weapon 1
- Primary Weapon 2
- Secondary Weapon
- Mask
- Vest
- Holster
- Backpack
- Gloves
- Kneepads
Whenever you pick up a Rare (yellow) item, keep it in your inventory, even if you pick up more powerful items, until you manage to unlock the Dress to Impress trophy.
If you're struggling to find any Rare items, don't worry. Once you hit the higher levels (current cap is level 30), Rare items become much more common.