3/4 sleeve t-shirts are great staples to have in your wardrobe; they can be worn for work or play and can be paired with anything.
You'll love this Lucy t-shirt from Bamboo Textiles; it has 3/4 length sleeves that are a firm fit. The main body of the t-shirt has a drape like fit, and is quite loose fitting.
It also has a round neckline, and is wonderfully snug and comfortable.
Wear with smart trousers for the office, and when the weekend rolls around, pair with your jeans and a scarf; you'll look and feel fantastic.