I think it can be a register, a memory. I look back in time and it makes me remember of what my life was like some years ago.
More than that, what I noticed is that posting my outfits makes me pay more attention to what I wear - and, consequently, makes me more stylish and original. Now, not blogging for some months, I realise that I do have to improve on that. I used to have better ideas. Cheers.