So I cut the pattern and I sew its seams
Continuing his metaphor of the sewing machine and what he does with his music:
“[Cutting] the pattern” refers to the manufacturing of clothes (“sewing of jeans”) again, Lupe is using this to describe how he takes his lines and uses them to create his own art.
Also, the word “cut” is used as a synonym of “eliminate”, as well. In other words, he is “getting rid of the pattern” and doing something different in hip-hop.
“Sewing the seams” is something else seen in clothes manufacturing. However, the word “seam” is defined as: a line of junction formed by sewing together two pieces of material along their margins. In hip-hop, Lupe takes the lines that he uses and connects them with each other… like the ends of cloth.
Also… note the homonym, “so it seems”, with “so it seems” from the opening line.
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