Purchase a robe. Write down why you are choosing a robe. Are you reasons on practicality or past programming.
I have purchased a long, dark green, and velvet hooded cloak. I intend on getting a gown in the color that represents whichever for of the Triple Goddess I relate to at that time. I chose green because I feel strong ties to the Earth.
I believe it was past programming and practicality that led me to this choice. A cloak is easier to wear, and provides a different tie to the Goddess by dressing accordingly. I also would like to honor those Wiccan who came before us. I feel as though a nice and simple gown, plus the cloak, pays a certain respect to the past.