PROS & CONS
Like anything, these techniques have both pros and cons to consider.
Garment dyed pieces are very soft and smooth to the touch, and generally shrink much less, if at all, when put through the wash. The colour coverage of a garment dyed item can vary slightly, often leading to a slightly faded, vintage look.
Piece dyed garments, while offering a more rich and bold colour profile at first, may lose dye faster and experience shrinkage when put through the wash. From a manufacturing perspective, piece dyeing is a time-saver for businesses making the same design in multiple colourways.