Happy Caps Sizing Chart

To Fit (male or female) 

Pat Anderson has made many beautiful Happy Caps using a loom.

Cap patterns, unless labeled as chemo caps, are sized to allow for hair.
Please adjust patterns to fit the actual measurements above and based on the tightness of your stitch.


More Sample Happy Caps

Adult Small
Circumference 18-20 inches - Brim Edge to Top minimum of 7 inches
Adult Medium
Circumference 20-22 inches - Brim Edge to Top  minimum  8 inches
Adult Large
Circumference 22-24 inches - Brim Edge to Top minimum of 9 inches




     Each Happy Cap must be handmade - knitted, crotcheted, loomed, or sewn.

  • Most patients will wear a medium size. 
  • Avoid patterns that create holes - our patients prefer coverage
  • Each must be new and unworn
  • They must be made of washable fibers and fabrics
  • We prefer that you not use wool at all.  If the hat does contain any wool you must say so on the tag
  • All Happy Caps MUST be made with SOFT yarns and fabrics. Many patients, especially the ones who lose their hair due to chemotherapy, have a very sensitive scalp. 
  • ​Appliqués or flowers, etc. must be easily removable
  • We prefer seamless caps for a smooth comfortable feel
  • Hats must be smoke-free, odor-free,  and pet hair- free​


Knitting, looming and crocheting are easy to learn. There are wonderful, easy-to-follow Youtube videos to teach you how and free patterns online to guide you.  Just Google "free chemo hat patterns".

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Cap Guidelines