Albert Barnes Commentary Ezekiel 27:7

"Of fine linen with broidered work from Egypt was thy sail, that it might be to thee for an ensign; blue and purple from the isles of Elishah was thine awning." — Ezekiel 27:7 (ASV)

Or, Fine linen with embroidery from Egypt was (Genesis 41:42) your sail, that it might be to you for a banner. Sails from Egypt were worked with various figures upon them which served as a device. Their boats had no separate pennons.

Blue and purple - Tyrian purple was famous. The Tyrians no doubt imported from the neighboring coasts the mollusks from which they dyed the fine linen of Egypt.

Isles of Elishah - See Genesis 10:4. Elishah is considered equivalent to the Greek Aeolis on the western coast of Asia Minor. This and the islands adjacent would very naturally have commerce with the Tyrians. In early days, the supply of the murex from the coast of Phoenicia had been insufficient for the Tyrian manufactures. The isles of Greece abounded in the mollusks.

That which covered you - As an awning.