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So starting from the beginning, this technique is used at the end of a hat when making it from the bottom up. I have a tutorial on that here!
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So once you finish the body of your hat, leave a long yarn tail to Seam it Up
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Take that yarn tail and pull it through the middle stitches of each side (front and back)
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Now pull that yarn tail through the middle stitches of the sides (left and right), then pull the yarn tail and close up those gaps
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So once you seam up the 4 sides, you'll have these little openings
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You'll do the same thing here, pull that yarn tail through the middle stitch of each gap, then close them up by pulling on that yarn tail
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You would now do this for each little gap that gets created until they are all Seamed Up
Row 2: Flip your SQ over, start at a corner space, make 4 CHs
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So now that there are no gaps left, you could leave it here if you want or you could now add a pom pom to finish your hat off
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This is how a Seamed Up Hat looks like when completed!
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The Glover Stitch, tutorial here!
The Cross Hatch Stitch, tutorial here!
The Piggyback Stitch, tutorial here!