Single Crochet Mesh Stitch
This stitch is a multiple of 2 + 1. When you crochet your foundation chain, make sure that the number of chains you crochet works with that starting chain formula. When you are deciding how many chains you want to crochet, simply choose a number that is a multiple of two, and then add one stitch to that. You need that extra stitch to ensure that the sides of your piece will turn out right.
Crochet your starting chain.
Row 1: Sc in 3rd ch from hook. [Ch 1, skip next ch, sc in next ch.] Rep sequence in brackets all the way across the row. Ch 1, turn.
Row 2: Sc in 1st sc, skip 1st ch, [sc in next sc, ch 1, skip next ch.] Rep sequence in brackets all the way across the row. End the row with a sc in the last st. I found that I was able to achieve straighter edges when crocheting my last stitch into the turning chain instead of crocheting it into the last sc st. You can do it either way, but whichever way you choose, be sure to be consistent. Ch 1, turn.
Rep row 2 until the piece is the size you want it to be.
Example 2
Chain multiple of 2 plus 1.
Row 1: sc into 2nd ch from hook, * ch 1, sk next, sc in next. Repeat from * across.
Row 2: ch 1, turn, * sc in next sc, ch 1, sk next. Repeat from * across to last, sc in last.
Repeat row 2 for pattern.