"...it has been drilled into me since I was a teenager that thinking about clothes, reading magazines, buying and especially TALKING about clothes is silly, bad, vain, and represents the worst of my behaviour and personality..."
I understand about this. We were raised with the belief that more than a cursory glance in the mirror was vain and clothes were simply for modesty and warmth.
I have always questioned this. I love clothes. I love what they say about people and how they speak for the wearer. I'm fascinated by how they reflect what's going on in the wider realm of culture. Things like shoulder pads during WWII because women needed to take over (traditionally) men's work and they needed to portray an air of assurance and strength. Or how in the 1960s the clothes reflected the wider trends in society to question traditional values.
I'm in academia, and it seems terribly frivolous to think about this stuff in some schools. There is a culture of nonchalance and feigned disinterest towards these things.
However, there is now a serious academic study of clothing in fields connected to material culture and art history. So when people say how frivolous clothes are or how we should be focussed on 'higher' things, I like to quote some study that relates how clothes are an important part of our culture. Some good ones include a study on denim by Daniel Miller at the University College London, and his work on culture in Trinidad is also enlightening. Depending on who you're with, they'll think you're a nut job or be quite interested in a theoretical perspective.
Anyway, all this to say that there is academic evidence that shows that an interest in clothes demonstrates a strong connection to culture and community.