Shibumi Firenze pocket squares are made in Italy and are designed to add a small amount of contrast to tailored outfits without competing with the rest of the clothing.
A simple pocket square is especially useful when the tie or jacket already has a strong pattern. White is the classic choice for formal wear, while a contrasting edge or subtle color can make the square feel a little less formal.
If you are also wearing a tie, avoid an exact match. It usually looks better when the pocket square picks up one color from the outfit or provides a clean contrast.