Opacity: Level 5

Note:
Level 1: Totally see-through that needs an inner to cover the neck.
Level 2: See-through that might need an inner to cover the neck depending on the colour.
Level 3: Semi-see-through that needs a double layer to cover the neck.
Level 4: Almost opaque and does not need a double layer to cover the neck.
Level 5: Totally opaque.