Dictionary Definition
h3704. כֶּסֶת ḵeseṯ; from 3680; a cushion or pillow (as covering a seat or bed): — pillow.
AV (2) - pillow 2;
band, fillet, covered amulets, false phylacteries used by false prophetesses in Israel to support their demonic fortune-telling schemes
Ezekiel 13:20 (ESV) “Therefore thus says the Lord God: Behold, I am against your magic bands with which you hunt the souls like birds, and I will tear them from your arms, and I will let the souls whom you hunt go free, the souls like birds.
Ezekiel 13:20 (ISV) “‘Therefore, this is what the Lord God says, “Watch out! I’m opposing your amulets with which you hunt souls as one would swat at a flying insect. I’ll tear them off your arms and then deliver those people, whom you’ve hunted like birds.
Ezekiel 13:20 (LITV) So the Lord Jehovah says this: Behold, I am against your amulets with which you are hunting the souls there, to make them fly. And I will tear them from your arms, and will send out the souls, souls which you are hunting, to make them fly.
Ezekiel 13:20 (NASB) Therefore, thus says the Lord God, “Behold, I am against your magic bands by which you hunt lives there as birds and I will tear them from your arms; and I will let them go, even those lives whom you hunt as birds.
Ezekiel 13:20 (NIV) “‘Therefore this is what the Sovereign Lord says: I am against your magic charms with which you ensnare people like birds and I will tear them from your arms; I will set free the people that you ensnare like birds.
Ezekiel 13:20 (NKJV) “Therefore thus says the Lord God: ‘Behold, I am against your magic charms by which you hunt souls there like birds. I will tear them from your arms, and let the souls go, the souls you hunt like birds.
Ezekiel 13:20 (TLV) Therefore thus says Adonai Elohim, "Behold, I am against your magic charms with which you hunt people like birds. I will tear them from your arms. I will deliver the people you hunt like birds.
I don't know about you, but most folks do not run around with "pillows" on their arms that need to be torn off. Amulets, magic charms, magic bands, etc fits the context of the passage better, and many translators felt the same way.
Take a look at H3704 that you posted. "Band" is there in that. You might have just overlooked it.
An excellent resource to digging into word studies is the Blue Letter Bible website. It is free and loaded with valuable resources. Orginal Hebrew and Greek texts of the entire Bible, Septuigent version of the OT, Latin Vulgate, word meaning via Strong's, and historical usage of words. The definition I posted above was from my Strong's on my computer, but I confirmed this all by consulting the BLB resources on the word's textual and historical usage.