Free Swim Trunks Sewing Pattern

Learn how to make a swimsuit for kids with a free swim trunks sewing pattern. This easy sewing project is for babies, toddlers, and kids!

This is a beginner friendly sewing pattern since it’s just an elastic waist. The elastic waist is easier to sew and comfortable to wear.

What fabric should I use to make swim trunks?

Whenever I make swim trunks I use a woven microfiber fabric or boardshort fabric. 

Supplies:

– 3/4 yard of board short fabric – 1/2 yard of swim lining (lightweight tricot or mesh) – 1 yard of 1/4 inch elastic – 1 yard of 1 inch elastic

STEP 1

Cut out two mirrored swim trunks from boardshort fabric. Cut out one lining piece on the fold from swim lining fabric.

STEP 2

Place the trunk pieces right sides together matching up all the edges. Sew the center front and the center back with a 3/8 inch seam allowance.

STEP 3

Line up the inseam with right sides together. Sew the inseam with a 3/8 inch seam allowance.

STEP 4

Turn the swim trunks right side out. Fold the leg hems up 1/2 inch. Fold them up another 1/2 inch. Sew the hems in place 3/8 inch from the edge.

STEP 5

Line up the lining sides right sides together. Sew the side seams with a 1/4 inch seam allowance with either a zigzag or a serger.

STEP 6

Cut two pieces of 1/4 inch elastic using the elastic cut chart. Overlap the short ends of one piece 1/2 inch and zigzag in place. Do the same to the other piece.

STEP 7

Place the lining inside the shorts with wrong sides facing each other. The right side of the lining will be against the skin of your child.

STEP 8

Divide the elastic into four sections. Divide the top edge of the swim trunks into four sections. Match up each section of the elastic with a section of the swim trunks.

STEP 9

Fold the elastic and edge of the fabric over so that the elastic is enclosed between the fabric layers. Zigzag the waist in place. Stretch the elastic to fit the fabric as you sew.

STEP 10

Tie a drawstring into a bow and tack it onto the front of the swim trunks. Sew a tag into the back waistband of the swim trunks.

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