Hi Sarah, your buttonhole on either machine should keep it from stop the cardigan from unravelling just be careful when cutting out the buttonhole that you do not cut the thread. Hugs from Maureen

Hi Dear, in this case I would use snap fasteners (snap studs, Druckknopf).
The material looks like cotton or cotton blend. It is really a bad option to put in sewed buttonwholes because the stitches have no hold in the material when you cut them.
Hu

How ab out sewing n some frog closures instead? Hugs. Nan

Could Velcro be an option?

Okay, tricky...If you decide on buttonholes, I would make sure you stitch them with a heavy interfacing on the back side to keep them from stretching...It won't completely keep the stretch from giving, but it will make them a lot more stable...I would also use a wide satin stitch buttonhole...

Maybe add fabric glue to the buttonholes before you cut. I just cheat and use toggles.

Thank you for your comments. I only wish we could buy the snaps which I think you hammer on. Unfortunately we can only get the old fashioned press studs that you have to sew on.
I think the buttonholes will be a bit too risky. Flowers for all.

Hi there why not trying frogs like thy use on Chinese dresses . They are usually sewn onto the garment and have a toggle to fasten through a loop
HIlda

How about some of those large, covered hooks - wouldn't take many. I'd stitch them on with strong white buttonhole twist. Should blend in if it shows at all.

If you are still looking for suggestions, I would get a length of grossgrain ribbon the color and length of your sweater and about an inch wide. Pin or baste the ribbon on the inside of the sweater front. Using your sewing machine, stitch down both long sides of the ribbon and across the short edge on top and bottom. Then I would use something like Solvy water soluble stabilizer like we use in machine embroidery on top and use the sewing machine buttonholer. The stitches would then go through the sweater and ribbon and that should keep it from raveling. I have seen this method on high end sweaters. Good luck which ever way you try!

Hi Sarah, I'm with the girls below. I'd reinforce the cardigan band first with some sort of grosgrain ribbon to ensure the area where you put the buttonhole is secure.
The other suggestion of toggles would also be great. Whatever you choose to do, please let us know how it all went. Love Chris

Another option not yet suggested would be to add some button loops. These can be crocheted from similar yarn or make some using fabric binding or ribbon. You can sew them in place as a decorative feature on the outside or underneath if you prefer them hidden. Then you can sew buttons to suit. Let me know if that makes sense. It would probably be the least damaging to the cardigan without distorting or damaging the threads