'Doubled' in the Bible

At the two corners they must be doubled at the lower end and finished together at the top in one ring. So it will be for both.

It is to be square when doubled, nine inches long and nine inches wide.

At the two corners they were doubled at the lower end and finished together at the top in one ring. So he did for both.

It was square -- they made the breastpiece doubled, nine inches long and nine inches wide when doubled.