Gather hair in a ponytail. Pull back as much of the hair as you can. Hairspray any loose hair, comb it back and secure the ponytail with a hair band.
Twist hair into one long strand and wrap it around into a bun shape. Use one or two bobby pins to secure the coiled hair into the hair underneath the forming bun.
Cover the bun with a hair net. You can keep adjusting and tightening the hair net until it fits snugly over the bun. Use extra bobby pins if needed.
Use as much hairspray as needed to keep the bun neat and to eliminate loose hairs. For thick, long hair, a flat bun is preferable--simply flatten the bun with the palm of your hand--removing the bobby pins you've placed over the hair net first--then secure the flattened bun with bobby pins.