You’ll need a 4.5” square ruler, a rotary cutter, cutting mat, and assorted fabric of your choice.
For each coaster, you will need 6 squares of fabric. (The square ruler and the rotary cutter make it easy to cut several squares at once so you can make multiple coasters.)
Take 4 squares, fold each in half, then iron.
You should have 4 halves, and 2 squares. Layout the folded squares, overlapping one end over the next to determine the placement you’d like for your coasters.
With the remaining squares, place them wrong sides together.
Then place your folded squares, on top of the unfolded squares.
BE SURE YOU GET THE CENTER OF THE FOLDED SQUARES AS CLOSE TOGETHER AS POSSIBLE! Also be sure that all your fabric lines up evenly on all 4 sides.
Sew all the way around with a scant ¼” seam. (I only use one pin in the center. You may want to use more. I’m just lazy.)
Clip the outside corners diagonally. (Excuse the glare, but you get the idea.)
Turn the coaster inside out and if needed, poke the corners out to a point, then press flat.
Slide your wine glass in between the folds and voila, a wine glass coaster. Or, if you are like me, you just use it as a regular coaster.