The wedding gown I am altering had wide lace straps which really did nothing for the gown and swamped the small young lady who will wear it.
So, she wanted spaghetti straps. I thought about cord, because it looks elegant and I wasn't sure I could find fabric to match. However, just one strand would look a little like someone added straps to a strapless. We liked the look of two strands twisted, more than 3 braided, which was a bit too heavy looking.
BUT, getting two strands twisted to stay twisted nicely was another thing.
I tried stitching the 2 together with a rayon thread that blended in. But the result was very stiff and not really twisted.
Of course they will look better altogether when on the gown on the person!