A deep blue t-shirt sits in that perfect place between bold and wearable. It is darker than a sky blue so it reads as more sophisticated. It pairs with neutrals easily but also with other colors in unexpected ways. The depth of the blue means it works in seasons where a lighter blue might feel too summery. Pair it with jeans for the most effortless look or with tailored pieces for something more intentional. The blue should have enough saturation that it does not look faded or washed out. The fabric needs to be substantial enough that the color stays true through repeated washing. The fit should be straightforward without complicated details. These are the deep blue t-shirts that work so well that you end up owning several in different fabrics.