I usually refer to the Ameda website, which has pictures showing a good fit vs a tight fit. It is branded, however, so may not be appropriate for certain settings (I used it when posting on a Working and Pumping message board, where branding wasn't an issue).
http://www.ameda.com/breast-pumping/why-does-good-flange-fit-matter-and-how-can-i-get-it
Spencer (MD, BFUSA BC)
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