Combining work clothing with the activitiy.

Joanne B Kaar - crottle inspired design on a traditional wrap style apron. Combining work clothing with the activitiy

The wrap-apron was often worn by women doing chores in and around the home. In the Scottish Highlands and Islands, this included dyeing wool with crottle. 

Crottle  or  crotal  (gaelic) is a Scottish term for lichens that were traditionally used as a dye.