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.