It was a general rule that witches should wear black clothes to honor themselves. However, that was also the common notion of humans. If Madeleine was seen always donning black all the time, along with her bewitching beauty, her neighbors could only solidify their claims on her nature. In fact, on days that Madeleine didn't feel like checking up on her coven, she would look normal.
That was why, when she heard that the apothecary was hit by some stupid werewolves wanting money, she begrudgingly went to check up on it. The clinic nearby it was also hit, so she figured she'd run into Dwight later. Still, she had already heat-styled her hair and prepared her non-black accessories. So, what if they saw her as a modern witch?