Step 1: Gather your materials.
* White fabric (at least 2 yards)
* Blue fabric (at least 1 yard)
* Gold trim
* Trident (you can buy one online or make your own)
* Seashells
* Fishnet tights
* Sandals
* Beard (optional)
* Wig (optional)
Step 2: Cut out the fabric.
* Cut out two rectangles of white fabric, each measuring 36 inches by 54 inches.
* Cut out one rectangle of blue fabric, measuring 18 inches by 54 inches.
Step 3: Sew the fabric together.
* Sew the two white rectangles together along the long edges, right sides together.
* Press the seam open.
* Fold the white fabric rectangle in half lengthwise, right sides together.
* Sew the side seams together, leaving a 4-inch opening at the bottom for turning.
* Trim the corners and turn the fabric right side out.
* Press the toga into place.
Step 4: Add the gold trim.
* Cut the gold trim into 1-inch pieces.
* Sew the gold trim around the neckline and hem of the toga.
Step 5: Add the seashells.
* Glue the seashells to the toga in a random pattern.
Step 6: Add the fishnet tights and sandals.
* Put on the fishnet tights and sandals.
Step 7: Add the beard and wig (optional).
* If you want, add a beard and wig to complete your Poseidon costume.
Step 8: Enjoy your costume!
* Your Poseidon costume is now complete! Wear it to your next costume party or event, and enjoy being the king of the sea!