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✨ The Helsinki blouse pattern: https://leslubiesdecadia-shop.com/col... In this video, you will learn how to sew an invisible bias for your armhole finish. I took the example here from my Helsinki blouse, but you can just as easily use another pattern. Remember to measure the armhole circumference to buy the right amount of bias. The bias used is 2 cm wide (closed width). Fully unfolded, the bias is 4 cm wide.