I would add something to this thread that may be easily neglected, though I believe it is important to mention... For me at least, a large part of the shame I felt early in my life was based around not just crossdressing, but the fact that by doing so I was violating someone else's privacy. This created a negative association with my feelings that went well beyond cultural views of crossdressing or being transgender, which I really had no inkling of at the time. I felt what I was doing was wrong, and didn't understand my compulsion to do it regardless. Desperate times call for desperate measures and all that.
It wasn't until recently that I bought my own clothes I was able to really put things in perspective and realize it was never the act of crossdressing that bothered me, it was how I was going about it. Without the moral guilt I felt at play, it was a vastly different, and entirely positive, experience.
In short: I won't make judgments on those who are driven by compulsion on this issue, I would be a hypocrite to do so. But, I still highly recommend getting your own clothes for the simple reason that it will be better for you.