I think it depends on the person. Remember that we are talking about PERSONAL development. If fashion or style is important to you as a person, then developing it is a sensible thing to do. If it's not important to you, then developing it would be rather pointless.
I don't follow fashion at all, I am not interested in labels or the latest trends. I do enjoy clothes and expressing my personality through developing my own style. I am also interested in how people perceive me differently based on my appearance, and I enjoy trying different looks to see how it affects people's reactions.
I definitely feel differently depending on how I choose to present myself, and I think most people care what they look like on some level because of how it makes them feel. |