A dark T-shirt has a factor of 10 to 12.
The young man was wearing a dark green T-shirt, which Sara lifted to check for further signs of damage.
She wore paint-stained jeans and a dark green T-shirt.
"You've done lots of things for me," she said to his dark blue T-shirt, "since you've been here."
He completed the outfit with a dark blue T-shirt and a red baseball cap.
He was glad he had worn a dark T-shirt.
A woman in black trousers and a dark gray T-shirt came to the low rail and called across to them.
We were both carded at the door by a muscular guy in a dark blue T-shirt.
He was in jeans, a dark T-shirt and a shortie denim jacket.
He's wearing no hat, and has on a dark blue T-shirt and jeans.