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This week I complete sewing my halter one-piece for my July Mash Up including finishing all the elastic, back hook, and front bow tie! Love how this pattern turned out with the lace overlay, and will make the perfect bridal swimsuit.

Mash Up Bathing Suit Pattern

For this month’s Mash Up, I’m sewing this one-piece swimsuit! from the 07/2019 issue, and I cannot be more thrilled with this pattern!

2 Step 6

Last week I finished off with sewing the top portion of the suit complete with sandwiched side seams to made the suit smooth on the wrong side at underarm point. So now it was time to attach the bottom portion to the top!

Step 7

I first grabbed my front lower piece and since they were already pinned together from cutting, basting the layers together around the edges was a breeze.

Step 8

But first, I wanted to stitch the crotch seam in a way that concealed the seam allowance within the layers. So I took out the pins just around the crotch area and I laid the pieces right side up on my table.

Step 9

I first grabbed my lace layers and pinned the crotch seam right sides together…

Step 10

…then I grabbed my green layers and pinned the crotch seam wrong sides together.

Step 11

I serged each crotch seam together and then pinned back together matching up the seams.

Step 12

This makes both crotch seam allowances concealed within the layers to avoid discomfort on the wrong side. At this point I basted the layers ALL around the bottom pieces so the layers now act as one.

Step 13b

With all the layers basted together, I then pinned each of my bottom side seams right sides together…

Step 14

…then serge-finished them.

Step 15

Now it is time to attach the top to the bottom! I made sure the notches along the top of my front bottom were visible and started with one of the tops to align with the notch.

Step 16

I worked my way around the suit matching up the side seams and the other top with the notch.

Step 17

Close up! Note: these are the notches along the top where the front tie knot ends along the bottom edge.

Step 18

Before I serge-finished around the suit, I first used my regular sewing machine to baste the notches – I found that these stitches made it easier to hold than pins when starting my serging.

Step 19

Once serged together I flipped up the top portion and my suit is almost complete!

Step 20

Here’s a close up of in-between the notches, and to keep the serging from flipping up I decided to topstitching around the circular seam.

Step 21

So I used my coverstitch machine to topstitch the seam allowance down.

Step 22

View from the wrong side after my coverstitching, I can safely say it won’t flip up now.

Step 23

From the right side I could now tie up my front knot!

Step 24

I now grabbed my back tie band pieces #25 and pinned them each right sides together along the longer edges.

Step 25

Once serged together, I flipped my small pieces to the right side and also stitched two rows of basting stitched along the top shoulder edges of my front top pieces leaving long thread tails for gathering.

Step 26

I gathered my shoulder edges as much as I could to match the tie band piece #25 lower edge.

Step 27

With the seams in the center of the band pieces, I pinned the gathered edge right side together with the corresponding band edge.

Step 28

I then stitched together and flipped my band pieces up!

Step 29

At the other unsewn edges of my band piece I pinned to the hook pieces in preparation for a swimsuit try on!

Step 30

Once I established the correct length, I used the zipper/piping foot on my sewing machine to topstitch in place close to each hook ridge.

Step 31

When I tried on the suit I also checked to see if the leg lines were ok before I elasticated the edges – luckily they were perfect so I could right to it! As I serged the elastic to the leg holes I slightly pulled JUST the elastic.

Step 32

At the start and end of the back bum curves, I stretched the elastic a bit more as I serged to create some cupping.

Step 33

The leg holes shouldn’t lay perfectly flat.

Step 34

I always like to double check that each leg hole is the same length as I don’t pre-determine and cut the elastic for each leg hole. I just cut and overlap the elastic when I reach where I started serging the elastic – so it is possible if the stretching is uneven from leg hole to leg hole that they can end of different lengths un-stretched. So I always like to check this before I topstitch them down.

Step 35

Then using my coverstitch I flipped my leg hole elastic to the wrong side once and topstitching from the right side.

Step 37

Here they are topstitched!

Step 36

My bridal swimsuit is complete! I really love how it turned out, and this one-piece swimsuit is very flattering and will definitely make it into my swimwear pattern regular rotation.

Can’t wait to rock this suit at the pool, now just need to find my future husband matching swim trucks – luckily for me he loves bright colors as well.

Happy Sewing!

Meg Healy Blog Signature


  • Photoburda_large

    Aug 7, 2019, 01.27 PMby Jnettistitches

    Swimwear is one of my passions. This is such a great way to add some interest and give more body to the suite. I wonder what coverstitch you are using? Thanks for sharing. Jnetti

  • Missing

    Aug 2, 2019, 08.59 PMby kerekeva

    Meg, When you serge the elastic to the leg opening on your bathing suit, do you cut the elastic band too, or just the seam allowances of the fabrics?

    Thank you so much taking your time for answering my question, Best wishes,


  • Head_shot_large

    Jul 25, 2019, 02.31 PMby Mckellm

    It turned out beautifully!

  • Burdalogo2_large

    Jul 25, 2019, 01.12 AMby Evmorales

    This ia so cute!

    • This is a question
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