To describe yourself, simply type:
You will be prompted for a series of lines, terminated with '.' on a blank line.
Alternatively, you can use the shorter form version of:
@describe me as <any>
This will set your description on a single line.
This description will be seen by anyone who looks at you with 'look <name>'.
To describe clothing, the syntax is similar to above:
@describe <clothing> as <any>