I buy quite a lot of clothes, usually for something specific. It's a frustrating experience buying clothes and animations if you don't want short and slutty or grande dame evening clothing. I have several dresses from Pulse and Chat which I loved, but which don't fit with my mesh body because they have scoop backs and there is a horrible choice between having transparent parts showing or body showing through the dresses. I have recently found one knee-length dress I love at ArisAris, which reacts to lighting and fits with my mesh body.
I also have a system head, having been unable to find a mesh head that I like or approximates the system head I have. I started as a plump avatar when I had a system body, but I became so fed up with the problems fitting clothes I have gradually become thinner and thinner.