Keep the T-shirt deliberately simple
A green trouser suit and white T-shirt pair a strong outer colour with a quiet centre. In a relaxed workplace, the shirt need not fit tightly, but it should sit smoothly beneath the blazer. A large graphic can change the effect considerably. Try a white shirt you already own before adding accessories. If it is too transparent for your preference, choose a more opaque alternative rather than layering several visible pieces beneath it. A small crew neckline sits away from the lapels without automatically needing a necklace.
Try it for a day spent sitting
Do more than stand in front of a mirror when trying the combination. A smooth T-shirt hem can bunch above the waistband once you sit down. After tucking it in, gently pull a little fabric back out to allow movement. The waistband should close comfortably with the shirt inside. Rest your forearms on a desk and see whether the blazer sleeves interfere with your hands. A cuff can shorten them slightly, but it should stay put without constant rolling. Continual readjustment suggests trying another size or cut.
Use white as a connecting detail
White shoes can repeat the T-shirt colour, although they are optional. Dark flats are a quieter choice, while a beige bag adds a softer neutral. Limit the number of new colours so the green remains the focus. For an evening appointment, replace the T-shirt with a simple top that has a different neckline. Keep the jacket and trousers initially and see whether that small adjustment does enough. The suit becomes more versatile without requiring a completely new outfit for every part of the day.
