Charles Ellicott Commentary Exodus 27:16

"And for the gate of the court shall be a screen of twenty cubits, of blue, and purple, and scarlet, and fine twined linen, the work of the embroiderer; their pillars four, and their sockets four." — Exodus 27:16 (ASV)

For the gate of the court —i.e., the entrance.

An hanging. —The word is the same as that similarly translated in Exodus 26:36 and Exodus 26:37; and the description of the “hanging” is also, word for word, the same. It would contrast strongly with the plain white “sail-cloth” round the rest of the enclosure, and would clearly point out the entrance to everyone.