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A mother daughter mermaid costume DIY project can create a coordinated Halloween look while allowing each outfit to suit its wearer. This tutorial pairs a baby’s mermaid-tail skirt with a walkable pencil skirt and flowing fin for Mom. Stretch fabric keeps the baby skirt flexible, and the instructions can be adjusted to fit different sizes.
Supplies for a Mother Daughter Mermaid Costume DIY
- 2 yards of stretch scale-printed spandex fabric for the baby and Mom’s skirt
- Mermaid shell template
- 1 yard of stretch green shimmery knit for Mom’s skirt
- Nude bodysuit for Mom and baby
- Iron-on glitter sheet
- Pink wig for Mom
- Straight pins and fabric scissors
- Kraft paper roll
- 1-inch elastic
- 1-inch foam roll for the fin
Before cutting, check that the fabric stretches comfortably and that the bodysuits fit well. Keep small embellishments securely attached, especially on clothing worn by a baby.
Make the Baby Mermaid Tail Pattern
Roll out kraft paper and make a loose outline of the baby’s body, drawing the tail fin below the feet. Measure around the rib cage, hips, and knees, keeping the knees in a comfortable, open position. Mark how high the skirt should sit on the ribs. Take measurements with the baby safely supported, and avoid making the tail so snug that it restricts movement.
Adjust the pattern to the measurements. Because the measurements go all the way around the body, make the pattern half as wide at each marked point. For example, a 20-inch measurement calls for a 10-inch pattern width at that spot. Add another 1.5 inches at the top for the waistband seam. Fold the paper down the center to create a symmetrical pattern, then cut it out. Fold the spandex in half, place the pattern on top, pin lightly, and cut the fabric.
Put the two tail pieces right sides together and sew around the edges, leaving the top open. Use a 1/2-inch seam allowance and a stretch stitch. If you are unsure which stitch to use, check your sewing machine manual.
Trace the tail shape onto the foam, then cut the foam about 1 inch smaller than the tracing so it can fit inside the fabric. Shape the bottom with a small V where the baby’s feet will sit above the fin.
Before inserting the foam, clip small V shapes into the fabric at the tail’s inward curves. These clips help the fabric lie more smoothly when the skirt is turned right side out. Take care not to cut through the stitching.
Fold the top 1.5 inches of fabric over to form the waistband. Sew around it with a .25-inch seam allowance, leaving a 2-inch opening. Thread the 1-inch elastic through the opening. Pin the elastic ends together and check the fit before sewing them into a loop; it should stay in place without feeling tight. Close the opening, then turn the skirt right side out.
Sew Mom’s Mermaid Skirt and Fin
Make Mom’s skirt using the same waistband method, but finish the pencil-skirt portion at the knee and leave the bottom open. This shorter base allows room to walk before the flowing fin section is added.
For the lower section, cut a large ring, or “donut” shape, from the green knit. Measure the width of the pencil skirt’s bottom while it is laid flat, then multiply that measurement by 2. Divide the result by 3.14 to estimate the diameter of the ring’s inner circle. For a skirt bottom measuring 15 inches across, the calculation is 15 × 2 = 30 inches, then 30 ÷ 3.14 = roughly 9.5 inches.
Measure from the bottom of the pencil skirt to the floor while wearing it. This measurement determines the width of the ring on each side of its inner circle. For example, if that distance is 20 inches and the inner circle is 9.5 inches across, the full fabric circle should be 49.5 inches in diameter: 20 + 9.5 + 20 inches. Check the length before cutting, since the finished skirt should hover above the floor rather than drag.
If you prefer not to calculate the dimensions first, cut a large circle with a smaller opening in the middle. Gradually enlarge the opening until it matches the pencil skirt’s bottom, then sew the pieces together and trim or hem excess fabric if needed.
Place the ring and pencil skirt right sides together, aligning the ring’s inner edge with the skirt’s bottom. Pin and sew all the way around using a stretch stitch.
Add the Shell Details and Finish the Look
Trace the shell template onto the iron-on glitter sheet and cut out the shapes. Resize them to suit each bodysuit, then apply them according to the sheet’s instructions. Test the iron-on material on a small area first if the fabric care instructions are unclear.
For a baby who is too small for a wig, make a simple headband from the tail spandex. Cut two long rectangles with rounded ends, sew them together while leaving an opening, and turn the band right side out. Hand-sew or glue the opening closed, then tie the band in a knot. Make sure it fits comfortably and does not become a loose item within the baby’s reach.
The finished costumes coordinate while giving the baby room to move in the stretch skirt. For a baby who is starting to walk or needs more freedom to move, skip the fin and make a small pencil-style skirt instead. Check the fit and mobility before wearing the outfit, and keep the adult skirt short enough to avoid tripping. With those adjustments, this mother daughter mermaid costume DIY offers a practical, handmade option for Halloween. — Laura
