If you'd completely indulged in the full spirit of the festival - the music, the drink, the drugs, the love and the nudity - there was a fair chance that you may have lost everything you came with. Even if you could remember where your tent was, there was likely nothing in it anymore. This was an era before cellphones, so you couldn't phone a friend for help, and plus you'd only have lost your phone anyway. For a few, 'everything' included the clothes off their back.
Here's a young girl who clearly decided that stripping down was the way forward, and then either couldn't find or didn't want her clothes when she was done. Now she's stuck on her own without transport or anything to wear, trying to find her way back to NYC. She's managed to keep some of her belongings with her in the bag, but presumably, nothing fit to be worn.