Good for your husband!
I had a similar experience recently not with a retailer but another business. I'd just moved house and wasn't in my best "bib and tucker" but not scruffy - the snotty tone of the person who refused me service was quite something!
I made a complaint which was also poorly handled.
I've taken great pleasure in not only refusing THEIR attempts to gain my business since (they keep contacting me on sm and by email as they seem now to realise I am someone who could have put a lot of business their way) but in also leaving a scathing review and telling as many locally as possible how they behaved towards me.
I hope it DOES lose them business I don't care if it's petty!
Big mistake, huge! 
I also used to work in the wedding industry and I'm horrified by the stories on this thread relating to that! For anyone wedding dress shopping now or soon GOOD boutiques will carry sample dresses in a range of sizes inc the dresses more flattering to larger brides IN larger sample sizes, even if I dress is a bit small for you but can be worn by you just with some gaps etc then modesty panels can be pinned on to give you an idea how it looks. Last I was doing this (nearly 20 years ago!) dresses went up to a size 36! Totally unacceptable (and poor business practice considering the size of our population now!) to not allow and plan for serving larger brides!
It's not like working in a clothes shop is a prestigious occupation so why do some sales people have such notions of themselves
I've worked high end/designer clothing retail at various points over the years, it's shocking how many of the staff think they're "all that" just because they work selling the clothes! Usually on nmw too! 
@HouseofGamers they were snotty in wickes?! That's hardly high end!
I learned at a young age as a waitress that the most casually dressed customers are often the wealthiest! We had one regular who was an absolute sweetheart but very quiet, came in most days for tea and a scone, paid in coppers most of the time too. I thought she was hard up and felt sorry for her and felt bad accepting generous tips off her - then one of the other staff members told me she was the local "lady" as in landed gentry! Millions and a huge country pile! But she didn't like it being made a thing of.
My mum had a similar experience buying her last car. She was dads carer and so in casual comfy clothes and shoes, she's not one for make up or jewellery etc plus jewellery was tricky with caring for dad. First sales room she went to were really snotty...and sexist. She then bought a very nice brand new car cash from another sales room. Drove past the first one, which is in her small village and doesn't get a lot of custom, waved and smiled.
The prejudice and snobbery against those of us who are heavier is disgusting and unwarranted.
Strange how the High Street is dying a death, eh!
Yes as both a customer and someone who's worked in retail I feel "the high street" claiming its online retail killing them are seriously missing the point! What's killing the uk high st in my opinion is poor customer service - snotty assistants as evidenced on this thread, assistants spending time blethering to each other rather than assisting customers, rude behaviour at the tills - increasingly noticing they don't even make eye contact! Let alone say please and thank you! Not just the staff on the floors fault especially the younger ones but a lack of training! When i first worked in retail we were guided on how to speak to customers, when to approach when to step back, knowing the stock! (Why do so many of them now not know what their shop stocks?!), knowing their customer base...
Customer service is a skill and it's rapidly vanishing.
Meanwhile Amazon and the like are raking it in not just because they are cheap and in Amazons case sell fucking everything you can think of and then some! But also because the customer service most of the time is not only excellent but goes above and beyond! If I need to return something to a high st store I "gird my loins" as in many cases I know I'm gonna get an argument! With online retailers it's rarely an issue
@whyohehy that's a really interesting story thank you