Old School Clothes Pin

This is my take on the one piece old school clothes pin. The center bore is 1/4" (0.25 in; 6.35 mm). This should work on the drying rails on a typical folding drying rack.

The photo of it in use pins a workout shirt (polyester) on an drying rack from IKEA (brand unknown). Be careful of slick fabrics (eg: polyester, silk, etc). They can slip off if the fabric is weighted unevenly on the drying rack rail. My tip would be to pin close to a thick part of the fabric, like the collar area.