SINGER 1200 Athena - Manual (Page 73)

BUTTOMHOLE LENGTH
A buttonhole length should be just long
enough to allow the button to slip through the
opening without stretching it,
« Estimate the proper buttonhole length by
measuring the width plus the thickness of
the button.
o To make sure the measurement is correct,
cut a slit in a scrap of fabric equal to the
diameter of the button you intend to use.
« increase length of opening until button slips
through easily.
This test is particularly advisable for buttons
of unusual shape or thickness.
^tarking Lines
putting Space Side Stitching
BUTTONHOLE INTEHFACING
It is almost always advisable to use an inter­
facing in the buttonhole area. An interfacing
holds the fabric firmly so that a neat but­
tonhole may be stitched and keeps the
finished buttonhole In shape, interfacing is
essential when the fabric is loosely woven or
is a crepe or knit that stretches easily.
When planning your garment, remember that
bar tack buttonholes are stitched through
three thicknesses of fabric — garment, inter­
facing and facing —after the facing has been
attached.
Testing Suîtonhole Length