APPAREL DICTIONARY - O -

Open End Yarn
Yarn produced though open end yarn spinning. Produces better yarn uniformity and regularity. Creates a better surface or substrate for spinning.

Optical Brightener
A chemical used by bleachers to make the whites whiter. In shirts to be dyed, the bleacher needs to know so he can ensure that the optical brighteners are applied evenly. Otherwise, once the shirt is dyed, it may come out splotchy.