There are quite a few threads on the topic. A lot of shoppers, who have shared their "system" love them. Here's one:
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www.mysteryshopforum.com]
If you go to the main forum page, select "search, in "search messages", type in "sizing audits", select "exact phrase", select "all dates", you will see.
(heart)
I intend to live forever. So far, so good.