Where to buy extra wide Size 11 us 9 uk, 43 women's women's slippers
PBS Guide: Pretty Big Slippers
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Designer Shoe Warehouse is a discount shoes & handbags chain with many stores across US & some in Canada too. Shoes available online up to size 13 US. Larger sizes may not be as common in store. Free US shipping, exchanges & store returns. Free VIP rewards program with perks.
Amazon.com
The Amazon Essentials brand does fashionable styles at great prices up to size 15 US and they've a good range up to size 12/13 us including Sam Edelman, Naturalizer and Journee. For sizes 13-16 us, they tend to be either Chinese brands or unisex. If you have Amazon Prime, many shoes have free, fast shipping. Plus you can even try before you buy.
Simply Be, UK
Plus size clothing store with hundreds of size 9 uk shoes & a few size 10s. Mainly their own brand wide fit (E) and extra wide fit (EEE) shoes. They also have standard width size 9 shoes from other brands. Casual shoes & boots, slippers & dressy shoes including bridal. Ships to UK & Ireland with free returns.
Leather shoes, boots, sandals & slippers made to order in Guatemala. Customizable styles in full & half sizes up to 15 us. 7 widths available from narrow to super wide. Book a free virtual fitting for help choosing the right size. Free US shipping, exchanges & returns for store credit. Ships worldwide.
Macys, USA
Famous US department store with a huge range of shoe brands online up to size 12, with plenty of 13s, some 14s & even a few 15s. Wide shoes up to 14 too, with narrow and extra wide shoes mainly up to size 12. Free US shipping for most orders & free US returns. Ships to 200 countries via Borderfree with all taxes included at checkout.
Debenhams, UK
Now online only, Debenhams do loads of size 9 uk shoes from brands including Paradox, Hotter and Gabor. Where's That From & Yours go up to size 10 uk & LTS up to size 12 uk (size up in LTS). Heads up: the size filter is a pain and includes all clothes and shoe sizes, so here's quick links to all size 9, size 10 and wide fit shoes. Debenhams are now owned by Boohoo like Dorothy Perkins which sells some of the same shoes.
Plus size clothing brand with a wide range of fashionable extra wide width shoes & boots available up to size 13 US. Retail stores across USA & Canada and website ships worldwide.
Specialist large size shoe store in Quebec also selling online to Canada ($10 flat rate shipping) with a wide range of women's shoes in sizes 10 to 15 US, with selected fantasy styles up to size 17 US. Large selection of brands and styles. They even do rain boots, slippers and socks. They are happy to advise on the right size for each style if you send them your foot measurements before ordering or during checkout. You can also visit their shop in Rue St-Hubert, Montreal. Website is in french.
Specialists in extra wide shoes, from 2E to 8E widths. Mainly comfort and traditional styles with over 100 size 9 uk options. Smaller range of size 9.5 & 10 uk styles, with a few trainers etc going up to size 12 uk / 46 eu. Shop in-store in Harrow, London where you can book a width fitting appointment. You can also order a catalogue or view it online to see the complete range. Their online width finder tools only go up to women's size 8 uk unfortunately.
Kohl's, USA
US department store with tons of size 11 and 12 shoes, plus a few 13s. Good range of styles & brands, especially everyday shoes or sporty sneakers. They're one of the few stores where you can return worn shoes if you're not happy, for up to 180 days too.
Shoebacca, USA
US online store with lots of branded women's shoes & boots up to size 12 US, with a smaller range in size 13 US. All widths catered for. Great for sneakers & casual styles. Boots & heels available too from several brands. Free shipping & returns (365 day). Shoebacca also offer a price match guarantee. Note a restocking fee applies to orders under $50. 10% student discount. Find current Shoebacca coupons here. Ships to US only.
US comfort brand with casual shoes, walking sandals, boots and slippers for all widths. Boots only seem to go up to size 11, but most styles go up to size 12, with a more limited range in size 13. Free US shipping.
Ziera, Australia
Comfort brand with stylish shoes, boots & slippers in medium, wide and extra wide widths. Free shipping for most orders & free returns too.
Completely customizable clogs with a medium or high heel up to size 43 eu (12.5-13 us women) or with a low heel up to 50 eu (17 us men, 19-20 us women, 12.75 inches). Modern lightweight or traditional Swedish clog bases available for all widths. Ppen toe, closed back & boot clog styles. Free leather swatches to choose your color. Mail them your measurements using their Find My Size form to create your get your own custom made clogs. Clogs made in the USA using US leather & bases from Sweden and Austria. They also do premium shearling slippers - the women's go up to size 12 with the men's version up to 13 (women's 15 approx). Women owned since 1975. Ships to USA only.
Plus size clothing online store & catalogue with lots of medium, wide & extra wide fit footwear up to size 13 us (46 eu, 11.5 uk). A few narrow fit styles available too. Especially good for casual & everyday shoes, but they also have dressy options & even slippers. Frequent deals & Free US returns. Ships to over 40 countries via Global-e. If you're in UK or Europe, you need to shop on One Stop Plus instead & only certain styles are available.
Next, UK
British high street chain Next has over 400 of their own shoes & boots range in size 9 uk (43 eu) online, although they may be rare in store. They also have footwear in sizes 10-12 UK from other brands including Yours, LTS & various sports brands (NB LTS run small, so go up a UK size). Their website navigation is not great on desktop, so I've linked directly to the Next brand size 9s as a starting point. But if you click on view more/all under the size filter list on the left, you can choose other sizes.