If you look at the hires version and that of the following photo, you'll clearly see a) they are wrinkled and b) the wrinkles are exactly the same in both photos (well, any self respecting hoax believer will point out that they doctored the same picture of the flag in different pictures of Aldrin).

http://www.hq.nasa.gov/alsj/a11/as11-40-5874HR.jpg
http://www.hq.nasa.gov/alsj/a11/as11-40-5875HR.jpg

Some years ago, I combined them into an animated GIF for the ALSJ:
http://www.hq.nasa.gov/alsj/a11/as11-40-5874-75.gif

Harald

PS: Don't miss Aldrin peeking towards Armstrong in the second picture.

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"Flying in space is risky business, but just staying on this planet is risky business too." - John Young, astronaut