To thread the tie through the diagonal sides of the apron I used a knitting needle. If you have a bodkin you can obviously use that too, but since so many of us are knitters as well as sewers I thought many readers might have a knitting needle on hand!

Place the tip of a size 6 (or smaller) knitting needle into the opening at one end of the tie. Try to get your needle into the fold so the needle is holding the tie firmly.

Push the needle and tie through the bottom (waist) of the diagonal side of the apron until it pokes out of the top. Hold on to the tie and remove the needle. (Then pull a good length of the tie through, but make sure not to pull it all the way through.)

Repeat the same process for the second diagonal side, only this time enter through the top of the apron and exit at the bottom (waist).

Pull through the tie so there are equal lengths on both sides. You can now adjust it to any length for any one of any height.