Not one.
This is huge.
Having a coverstitch machine has been a game changer for me. I have not purchased a single knit garment for anyone in my family since I started using it.
Before, I would sew the t-shirts and the leggings, but it was usually an exercise in frustration. My sewing machine, I suspect, hates knits more than most sewing machines. Despite my best efforts and all the tricks in the book (stretch stitch, walking foot, stretch needle, ballpoint needle, Microtex needle, universal needle, knit stay tape, regular stay tape, Wonder tape, tissue paper, Woolly Nylon, etc.- seriously, I have tried everything); no matter what, the machine would still skip stitches and chew up and/or build giant poopy birds' nests under my fabric. The tension would be uneven, and sometimes it would just stop sewing altogether. And still, I would muddle through, get it done and make it work. But then a day/week/month later the hem would break and then the garment would molder in my mending pile forever. And because I hate mending, often my kids would outgrow the clothes before I took care of them. Wasted time, wasted fabric. And this made me more apt to throw a few t-shirts into my cart at the thrift store.
But now? Between my serger (Brother 1034D) and my coverstitch (Brother 2340CV), I can sew all the knits. I can use hem bands if I want to, but if I don't want to, I am free to turn up and coverstitch any old hem I please. The coverstitch is not fiddly to thread like my serger, so changing threads really isn't a big deal. And I use it all the time.
For me, the coverstitch made sense. My kids and I live in knits, and for Natasha and myself especially, it's not easy to find tees and leggings that fit properly. I love being able to sew them for us, and now I love not having to mend them. If you sew a lot of knits and have trouble with popping hems, I'm here to tell you that the coverstitch is a worthwhile investment and that you really won't regret getting one.
Recently I used the coverstitch to finish three Thread Theory Strathcona tees that I made my husband earlier this month. Like any smart fabricaholic, I used J's lack of enthusiasm vis a vis the fabric I chose for his first Strathcona, to buy more fabric. I made sure there was an orange knit in the bunch for my neutral-hating husband.
I sewed the shirts in a size medium again. I shortened all the sleeves by 3" and hemmed them up 1/2". The length on the orange tee is per the pattern; the other two are shortened by 1".
The knits are all from The Fabric Fairy, except for the mustard neckband on the light blue shirt, which is Art Gallery knit in Sahara Sun. The light blue and the charcoal are both beefy 10 oz knits with excellent recovery. They are fabulous - a rare cotton/lycra knit that is truly thick and stretchy enough to make durable kid leggings - and I plan to order more of the charcoal for just that purpose. I have no affiliation with The Fabric Fairy - I just think these are really high-quality fabrics.