What does this mean

Que llevan uds.?

4 answers

What are you carrying?

(The "you" is plural)
what are you wearing
"Wearing" (clothes or a hat, for instance) is another use of the verb llevar. See
http://spanish.about.com/od/usingparticularverbs/a/llevar.htm

So Bob's version can also be correct.

However, it is unlikely that one would ask more than one person what they were wearing, with a single question.
LLevar is such a handy verb = to wear, carry, bring, take

Sra