Ive never really understood what a coverstitch is or does.
I understand what an overlocker does; finishing seams on (usually knit fabrics) and trimming excess fabric off at the same time but a Coverstitch is beyond me.
A CS is sort of an overlocker for hems. If you sew a lot of knits, this give the hem in RTW garments you see for sale. Look at a t-shirt and the twin thread stretchy hem is what it is.
I know I do more coverstitch hems at work then all the others combined.
@So Chic I'll say this: I had one that was older, and temperamental to the point I would have rather hand sewn hems then use it. I got a new one and it was an absolute game changer in making them. When I get into work today, it will take me right at 20 minutes to do a pant hem with the machine..most of that is marking the hem and trimming the fabric. I can thread it and sew a hem in about 5 minutes (mine is out all the time). Before it was taking me about an hour messing with the older one.
There are also attachments to add bias binding with it to items, which is also a good help when making necklines.