I think the construction is fairly straightforward and could be achieved using fabric glue -but getting just the right flowers will be key. Etsy looks to have some nice choices for that type of supply though. Here's one example: Etsy silk flower applique

Did the belt have more substantial fabric than just the organdy ribbon under the flowers? Seems like you'd need to create some structure.

I don't know if it had anything other than the ribbon. Unfortunately, I didn't actually examine it closely.

At first we thought that there were some feathers on it, which I think would look nice too. An exact copy isn't what I'm looking to do, but something inspired by this belt.

I've found some good tutorials for making the organza flowers. I'm excited about starting this project. I hope to have it done to give it to her for Christmas. Fortunately, the wedding isn't until June.

I would venture into a bridal store and look at these kinds of sashes. Do some investigation on what is behind the flowers.

If she does't REALLY want it to wear--just wants the flowers to embellish her dress..it is easy enough to find prepackaged petals at fabric stores....This will be a fun and really not overly complicated DIY. Back in the day I made flowers for my sister's head gear for her wedding...we still laugh at my attempts at a flower and her saying "well more this or less that" until we found one she thought was JUST RIGHT and I duplicated it enough times to adorn her veil. Petals, fabric glue, base fabric...needle and thread to stitch it to the dress....

You might also look at the following websites to see if you can find a gently used one:

oncewed.com

preownedweddingdresses.com

tradesy.com

poshmark.com

mercari.com

bravobride.com

and, of course, ebay.com

The materials for that (to look quality) might get expensive. I saw a couple things. What’s our budget?

My budget is less than $300. :-D

I'm sure that I can make it for a fraction of that cost. I can make the flowers out of organza fabric, add a few beads, ribbon, etc...

Under $50 FOR SURE possibly under $25.....

Maybe you're already thinking this way, but with only the photo to go by, my guess would be that they used a stiff white interfacing as the backing for the applique of flowers -- maybe even multiple layers for stability -- and then attached the whole thing to the ribbon. That's how I'd approach it, anyway. I'd definitely do small test pieces and make sure that all the materials / techniques you use will actually function as needed.

If you have a store that specializes in trims, look for a piece of sinamay to use as your base. They may also have flower petals and shapes already cut to build your flowers. (Or buy some silk flowers and take them apart.)

Cover the sinamay with lace, then build your flowers. After your flowers are built, add the pearls and whatever else to finish the florals. Then attach the sinamay to the ribbon to make the belt.

I only know this because many years ago a group of us wanted to make pretty headpieces for our daughters’ first communion veils. The owner of the trim store walked us through the whole process. We used needle and thread to put it all together. Little tiny stitches. If using glue, be sure to test the color and thickness of it when it dries.

I've never heard of sinamay, maddielee. I hope I remember it the next time I could use something like that!

Hat makers use sinamay for the bases of many of their smaller creations, like fascinators.

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terriks, did you ever make the sash?

No, I haven't made it yet. The wedding was postponed from June this year to June next year, and I'm a procrastinator, so perhaps next April?

I'd be checking to see if you might get the sash at a discounted price with so many weddings simplified or postponed, If not, start looking for supplies a lot sooner than you think you would need to. Since the pandemic started and having tried to shop for materials, that $300 looks a whole lot better than it did at the time of the original post.

I bought the supplies months ago, just haven't gotten around to doing anything with them!