Choose a suitable fabric such as cotton, linen, or silk
Cut the fabric into a square shape
Common sizes are 10 x 10 inches or 12 x 12 inches
Fold and press the edges inward about 1/4 inch
Fold and press again to hide the raw edges
Sew the folded edges with a straight stitch
Use matching thread for a neat finish
Trim any loose threads
Press the handkerchief with an iron
Fold it to fit neatly in your suit pocket