Women and breasts come in all sizes, so we need all sizes. Knit whatever strikes your fancy. Knit your size. Knit your sister’s size. Just knit.
When choosing a yarn, look for dk or sport weight. You want something that is soft, lightweight, and that breathes. My favorite yarn for the boobs is Cascade’s pima tencel, a cotton/tencel blend. Many are making their boobs out of Debbie Bliss’s baby cashmerino. Bamboo is another good choice. Avoid pure wool as it can be itchy when close to the skin. Check your stash, ask your friends to swap yarn, have fun and be creative!!
We stuff each breast with poly-fill, but always leave a small opening so the recipient can adjust the size by adding or removing filling, and then sewing up the seam themselves.
The Tit -bits pattern provides instruction to begin the front of the boob with a short i-cord that will be tied into a knot to form a nipple. I have found that most women prefer the knitted breast without the faux nipple. Just cast on, and begin your increases!