I have found that I may need to cloth a character in one of my stories, this character has no relatives with clothing to borrow, and will be "shopping".
To start I would need shoes, I found a link that mentioned that the average person's feet are 15% of a person's height. Yes that is average and real life can go either way. foot size in inches = (15 x height in inches)/100. This will work in metric also, either way one would than enter the result in to a shoe sizing chart of the proper units. info on ratio was from Wiki Answers. Also noted was that this formula worked best on fully grown adults.
I than went to Zappos and used their chart to convert the size in inches to the shoe size. Another site, mentioned that one should go up a size for closed toe shoes and heels.