We have both the Filmation and MYP cartoons showing the previous Sorceresses having the same color clothing as their successors: Kuduk Ungol & Teela-Na (Filmation) .... Veena and Teela-Na (MYP) to me that was just an easy visual for the audience to realize that they're becoming the next in line to be the guardian of Grayskull's power.
My own personal preference would be that they all have distinctive styles and colors in their clothing. As their power passes on to the next Sorceress, that power should give her a form suitable to each woman in style and color different from the last. Like the Witchblade power changes color as it changes wielder. I don't know how many Sorceresses there have been between Preternia and the He-Man/Adam era but I'd like to think each one had a unique style and color to their clothing.