WHBM ladies women slacks pants straight leg dark Purple Size OS

WHBM White House Black Market ladies women slacks pants straight leg Dark Purple Size OS I am not sure what WHBM sizing OS means, but based on my size I’m guessing these should be about a size 4 in comparison. Please see pictures for actual measurements. No rips, tears, snags or stains. One fastener needs to be better secured (see picture). All pockets are like new and still stitched closed. Excellent used condition.