Garment dyed clothing tends to bleed color into the wash water much more than pigment dyed clothing .

And it’s difficult to alter garment dyed clothing because when you break into the seams of the garment to adjust it for size? You will find quite often that they dye did not seep all the way in to every seam, through all the layers, or underneath the top stitching. That area will often stay white , so after the alteration ? that difference in the color may be very obvious.