Most Buddhist monks could easily get under the "15 things" limit-- the standard list of possessions is: three robes, an alms bowl, a cloth belt, a needle and thread, a razor for shaving the head, and a water filter.
[1]http://www.accesstoinsight.org/lib/authors/thanissaro/bmc1/b...
[2]http://www.accesstoinsight.org/ptf/dhamma/sila/dasasila.html
I've heard this list other places too but don't have a source. The four requisites mentioned on that page are what I typically think of.