There are many different apron forms depending on the purpose of the
apron. A basic distinction is between waist aprons which cover the body
from the waist down and a bib apron which also covers the upper part of
the body.
An apron is usually held in place by two strips of fabric
that are tied in the back. A bib apron may either have a strap in
around the neck (perhaps the most widespread use today), or shoulder
straps that criss-cross in the back and attach to the waistband. The
advantage of the former design is that it makes it especially simple to
put on the bib apron. The advantage of the shoulder strap design is
that it makes the apron more comfortable to wear; a neck strap can
slightly impair ease of movement that's why most of our bib aprons have adjustable neck as a standard feature.