John Gill Commentary Exodus 28:32

"And it shall have a hole for the head in the midst thereof: it shall have a binding of woven work round about the hole of it, as it were the hole of a coat of mail, that it be not rent." — Exodus 28:32 (ASV)

And there shall be a hole in the top of it, in the midst
thereof
At the neck of it, for the high priest to put his head through when he put it on:

it shall have a binding of woven work round about the hole of it ;
a large hem or selvage, perhaps of the same kind of woven stuff the robe itself was made of, and this was done to strengthen it:

as it were the hole of an habergeon ;
a corslet or coat of mail;

that it be not rent ;
when the high priest put it on; or through the weight of the ephod and the ouches of gold on the shoulder pieces of it, and the breastplate hanging down from thence; this may denote the strength and duration of Christ's righteousness, which is an everlasting one.