She told the Huffington Post last year that fed-up buyers needed to be more pro-active: "It's quite easy to just write a letter."
In Huffer's pop-up store, 12 - "medium" - was the largest size in stock. Meder asked the shop assistants what size the brand went up to and was flatly told: "14."
Then, as she browsed a rack just a couple of steps away, the staff whispered between themselves about the sizes.
Huffer designer Steve Dunstan said the brand had offered size 16 in the past but the demand did not justify the cost of production.
Nearby in Sass & Bide, only sizes six and eight were displayed on the shop floor, with 10s and 12s available on request.
Asked if there was anything to fit a size 16, the assistant scrunched up her face and pointed to a shapeless, mustard-coloured dress.
Miss Crabb and World were among a handful of boutiques that catered for a range of sizes.
World designer Denise L'Estrange-Corbet said it went between an XS and XL in all styles, and XXS and XXL in some. It was ridiculous many New Zealand retailers did not cater for even a size 14 (XL).
Miss Crabb designer Kristine Crabb said she made her clothes to fit "true" sizes, but some labels called a size 12 a 10 to flatter the customer into making the purchase.
"Some women fit the size 14 perfectly, but they don't want to buy it because it says '14'. In other stores they might be a 12."
Plus-size designer Caroline Marr, of The Carpenter's Daughter, said it was astonishing so many labels excluded a large portion of the market: "It's my niche and I'm all that."