Today I ripped an old worn (english) shirt somebody gave me. I like to do this if I see something in the construction which interests me.
Now when I came to the collar, I saw it had a fusable interfacing. It was made out of two pieces. One small which was cut like the collar was fused to the bigger one which the size of the collar with s.a. Okay - nothing unusual.
What makes me wonder was both were cut in the bias.
Have you ever done this and why?