Calculating hat band size

How to calculate the size of the hat band for the tam

a)    First, measure around your head above the ears, roughly horizontal.  This is where the hat will sit.  This number is the circumference.  C=________.

b)    Now find the corresponding radius, R (using C=2πR).  R = _________.

c)     Now figure out how thick the layers of velvet, interlining, lining and hat band will be. (These layers, when sewn into the band, will make the radius of the opening smaller than the radius of the seam line).  Call this number T.  T= ______.

d)    The radius of the circle you actually want to sew along will be R + T.
R+T = ______.

e)   This is the size of the circle you will mark on the brim as the seam line for attaching the band.



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