There are various grades of muslin, Sometimes one washing is just not enough to get the shrinking out of its system.

It's great for crayon quilts and as a neutral base for applique.

I used to use muslin a lot but now prefer tone on tone. But is you are usig muslin besure and get a good quality. There are definitely different grades of muslin. Marge

I once used several bolts to make floor to ceiling curtains for my screened in porch. I had VERY nosy crabby neighbors who had nothing better than to do than constantly spy on me (with binoculars, even!). I used the muslin because it was cheap. Anytime I was out on the back porch I could pull the curtains for privacy.
The crabby neighbors finally moved (we lived next to each other for 15 years) and the "curtain" became a couch cover to protect my upholstery from my 2 year old.
Rose Hall

I like to use it for quilting backing; stitch out a new embroidery design; use to embroidery labels; and use it in the quilt top if I want a really old fashioned look....and I'm sure there's something I'm forgetting :lol: :lol:

well, now that you have asked....I just bought three bolts!
I will use it for everything.
I will back my kids and grandbaby quilts with coordinating fabrics, but will back my own with this, as I am planning on doing some of mine, as summer quilts.
I will use it for table runner backings, wall hanging backings, topper backings, line tote bags with it. I think I will even do a country looking quilt and put some on the front. Maybe some hand embroidery.
I will wash and dry several times first though! :D

I don't think your LQS know what they are talking about.

I use Muslin for background material for scrap quilts and backings on some of my wall hangings and table runners. It's easy to work with and inexpensive.

I use it for strip piecing leaders and enders. A good quality muslin is as nice as any quilt shop fabric. I hate rough, thin, crisp, cheap muslin! Why even make something so hideous?

Long ago in a far away land....it was not uncommon to use muslin to accent the blocks as the attached pics show. This is a Sampler Quilt I made over 20 yrs ago (yep, I'm slow, that's another story for another time) that I am hand quilting. Using the muslin was "recommended" by the ladies at the lqs - funny how time changes - LOL. The quilt guild I was in (early 80's) made blocks each month and had a drawing to see which member would recieve that monthly block, I made an extra block for myself and made a Sampler Quilt (that's part of the story)