Wide width Size 11.5 us 9.5 uk, 44 women's slippers
DSW, USA
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.
Cinderella Shoes
Women's shoe store specialising in large sizes 8-13 uk (up to 15 us or 47 eu), including half sizes. Huge range of smart & casual footwear from 25+ European shoe brands including their own exclusive labels. Growing range of wide width styles. Ships worldwide from Ireland with taxes paid for UK, US & Australia orders.
Amazon.com
You can get great deals on large size shoes at Amazon with a bit of patience. Their own Amazon Essentials range does fashionable styles at great prices up to size 15 US. The women's shoes department goes right up to 16 US, although many of the largest sizes will either be Chinese brands or unisex. If you have Amazon Prime, many shoes are eligible for free, fast shipping. Plus you can even try before you buy.
Adelante Shoes, USA
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.
Bared Footwear, Australia
Podiatrist founded brand for stylish comfy footwear of all types, from casual to work to bridal. Unique footbed "fit kits" mean styles can be customised for both narrow and wide feet as well as half sizes. They've a few stores in Australia and offer free shipping & returns worldwide with taxes included for UK orders.
Very, UK
Online department store with several footwear brands up to size 9 uk including Dorothy Perkins, River Island and a few of their own exclusive V by Very styles. They also stock Yours & City Chic wide fit shoes up to 10 uk & Long Tall Sally range up to 13 uk (but that only fits 12 uk). One advantage of buying via Very is your get free 28 day returns.
Debenhams, UK
Now online only, Debenhams do loads of size 9 uk shoes from brands including Paradox & Hotter, Where's That From & Yours up to size 10 uk & LTS up to size 12 uk (size up in LTS). The shoe size filter is a bit unwieldy, so here's quick links to all size 9, size 10 and wide fit shoes. Free delivery & returns.
John Lewis, UK
Famous department store with lots of size 9 uk women's shoes, boots & trainers online along with a few wide fit styles & size 10s. Several brands including Sam Edelman, Hotter and occasion wear / bridal styles from Paradox and Rainbow Shoes. Heads up: they have lots of LK Bennett size 9s, but I think these 42s aren't proper size 9s unfortunately.
Wide Fit Shoes, UK
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. You can also order a catalogue or view it online to see the complete range. Their 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.
Hudson's Bay, Canada
Known as 'The Bay', this famous department store has over 80 branches across Canada. Their online store usually has around 1000 size 11 shoes, about 100 size 12s and a smaller range of size 13 shoes in stock with free shipping and returns. Brands include Clarks, Sam Edelman, Cloudwalkers, Aravon and Cole Haan.
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.
Aquatalia, USA
US luxury footwear brand offering a wide range of shoes & boots up to size 12 US. Many styles also available in wide fit. Shoes made in Italy. Shipping worldwide, but products more expensive outside US with duties added (shown at checkout).
Ziera, Australia
Comfort brand with stylish shoes, boots & slippers in medium, wide and extra wide widths. Free shipping for most orders & free returns too.
Woman Within, USA
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.