Craft:

Materials:

Old T-shirt Choose a shirt that is one or two sizes larger than you normally wear. I chose a men's size medium when I usually wear a small. Note that this does not work with baby-doll tees.
Thread to match T-shirt
Wide shoelace or cord
Scrap fabric similar to that of the T-shirt
Disappearing ink pen
Scissors
Pins
Body double friend or dress form
Tape if using a friend
Sewing machine

Directions:

Step 1: Fold the shirt in half and pin it by matching up the shoulder seams, armholes, and side seams, as shown above.

Step 2: Pin a line going down the vertical middle of the shirt (along the half-fold line that is created in Step 1) on the front and back. After you are done pinning the fold line, unpin the rest of the shirt so that it is no longer folded in half.

Step 3: Open up the top of the shirt by cutting across the shoulder seam and the top of the sleeve.

Step 4: Figure out what length you want the tunic to be by putting the shirt on a friend or mannequin. Adjust it until it is the correct length, and tape or pin it in place.

Step 5: You will be attaching straps to the tunic so that it hangs at this new length. Determine how long the straps need to be by measuring the length from the top corner of the collar on the front to the top corner of the collar on the back.

Step 6: Using the disappearing ink pen, draw in a new neckline for the tunic on the front and back. Remember, this can be a revealing sexy neckline since it is a swimsuit cover-up. Start drawing the neckline at the shoulder right by the collar, then draw the neckline as low as you wish, stopping at the center line made by the pins (drawing in one half of the neckline). You can make it V-shaped or U-shaped — it's up to you.

Step 7: Using the disappearing ink pen, draw a new armhole for the tunic on the front and back. Start drawing at the shoulder, 1" away from the neckline. Then continue down to the bottom corner of the sleeve.

Step 8: Fold the shirt in half along the line that you pinned in Step 2, and cut out the neckline and armholes on the front and back.

Step 9: Using the sleeves, cut out straps for the tunic. Make them 1" in width and the length determined in Step 5. Add ½" to the length for seam allowance.

Step 10: Sew the straps to the tunic using two 1/8" zigzag stitches on a ½" overlap. Cut off the excess fabric so that the zigzag stitches are close to the edge of the fabric.

Step 11: Try on the tunic and determine where you would like to place the drawstring waist. Mark this height with a pin.

Step 12: Using the clear ruler and disappearing ink pen, mark where the drawstring will be on the inside of the tunic. Measure the distance from the bottom edge of the tunic to the pin with the clear ruler. Then draw a line around the entire tunic, using the clear ruler to measure the same distance from the bottom edge to where you are marking the line.

Step 13: Measure the width of the tunic. Using the scrap fabric, cut a piece that is the width of the tunic and 1½" in height.

Step 14: Pin the scrap fabric to the inside of the tunic by using the waistline you drew in Step 12 as a guide. This will become a channel for the drawstring.

Step 15: Using the sewing machine, zigzag stitch along the top and bottom edge of the scrap fabric.

Step 16: Cut a slit in the center front of the tunic waistband and thread the shoelace drawstring through the channel.

Now put on your shades, grab your favorite tote, and head for the beach in your new swimsuit cover-up!

About the Author:

Diana Eng is a NYC-based fashion designer, Project Runway alumni, co-founder of NYC Resistor, and the author of Fashion Geek: Clothes, Accessories, Tech. Visit her at her blog, Fashion Nerd.