WHY SEW A MUSLIN, OR EVEN 3?

Sewing this past weekend consisted of sewing  2 muslins and then cutting a second one for my dress and sewing it.  This from a woman who usually tissue fits.  I always think that it will take so much time, but honestly, I have perfected the art of quick and dirty muslin sewing.  No hems, so facings and I try and keep a bolt of muslin, one of the only things I buy at Joann's with a coupon of course. I know that lots of people make 'wearable' muslins, but that has always been an oxymoron to me or an expensive muslin if it doesn't work out.  The other thing is that I would never spend that much time on cheap fabric.    I like to be able to draw on my muslin with a sharpie.  I like to mark the center front,  the cross grain and the waist so that I can see it in the mirror when I fit.  The plain light color of the muslin is helpful in seeing the wrinkles that point to fitting problems.
So why did I choose to sew a muslin for my jacket, which I had already  tissue fit, and my dress, which I also had tissue fit?  I  wasn't sure about either of the styles and I wanted to have the least amount of ripping and adjusting when I sewed the good stuff.  I usually sew jackets with princess seams, but they tend to be more fitted than I wanted for this jacket and I've never sewn a jacket like this before.

I was pleasantly surprised with the jacket's fit.  As you know I am a curvy woman, with a 36 DD bust.  One dart is not usually  the best or easiest fitting solution for me but this worked amazingly well. Why you ask?  See that dart that meets the pocket opening and how the upper pocket mouth is actually on or close to the bias?  Sewing that dart  makes  the  section of the jacket  to the left of the dart  fall on the bias.  Bias molds very nicely without this being in anyway a fitted jacket. The fit is very good.  I made all my usual alterations on the pattern, except that I started with a size 40 in the upper body, instead of the 42 that I've been using and the fit is much better. 
My upper bust measurement is just a bit more than the full bust  of the size 40.  I blended it out to a 42 by the bust line.  It's easier to get a nice line when I blend it out for the hip, where I need a 46 or a bit more depending the ease.
The dress, now that needed two muslins to get a good fit.  I'll get to that in my next post.  I want to take some photos first.

I also did some thinking and research over the weekend  on Passover  menus and recipes.  How about gluten free, vegetarian.  Lactose free would be helpful too.   I have a number of Passover cookbooks, but I found a mother lode of information on line.  Google Gluten free, vegetarian Passover main dishes and there are a ton of recipes available.  Very cool, but I still love to read my cookbooks, or novels as my dh calls them.
Edited to add that only two of the guests are vegetarian.  Two are gluten free and one, myself, is lactose intolerant.   We are having a meat main dish, but I wanted to have good food for the vegetarians too.  It is certainly doable.  I am leaning towards a vegetable curry and a quinoa pilaf.  But there will be no gluten free matzoh.  It's disgusting, and at $28, at least the year my dh was diagnosed, not worth it since he had one piece and we threw out the rest.