So last year I asked a granny, lovely Lydia in Albury. She scrambled around around in her crochet bag and came up with a size 1 hook. Instead of getting me to do the work she crocheted away while talking to me but still managed to impart the right knowledge. Yesterday, after 9 months, I finally gave it a go.
I used a size 1.5 hook because the only other option was a 0.75 and I reckoned that might not even have a hook on it, it is sooo tiny. LOL! The yarn is a cotton, I think. I bought it for $2.99 at the local cheapy shop because there is no where else around to get it here except maybe Kmart.
Then I just start to crochet into the fabric. That's right - you just poke the hook into the material and pull your yarn through and do ordinary double crochet stitches. That is why you need such a tiny hook. I imagine a finer teatowel could well do with a finer hook and possibly that may require thinner yarn.
Next 2 rows I only crocheted every second stitch, again in dc.
Next 2 rows have a treble in the first 2 stitches, miss a stitch, then repeat. Because of the unknown quantity of the original number of stitches you may have to have a stitch more or less at the end. Play it by ear.
At this point I had 8 stitches. I continued on doing treble for 16 rows of 8 stitches.
17th row. 2 treble, 4 chain, 2 treble.
18th and final row. 1 half treble crochet, 1 treble 4 trebles in chain gap, 1 treble, 1 half treble crochet and sign off.
On the bottom of the towel I crocheted into the towel and returned with a row of lace, each time something different according to how I felt.
This is a very basic tutorial. A lot of what you do will have to be arranged according to how many stitches you originally crocheted into the towel. I guess this is a bit like the older cook who knows the basic recipe and just does it without ever measuring a thing and it always works. Hope this works for you too!