The suggestions in the charts are guidelines only. Long
satin stitches, such as in bargello, usually require one extra strand or
ply of thread. Some decorative stitches require a finer thread or fewer
plies. Bear in mind, also, that the ground fabrics you stitch on can vary considerably. What is suitable for a 25 count linen, therefore, may not
be exactly right for a 24 count Congress cloth. Always do a small test
swatch with the fabric, thread and stitches you have in mind before beginning
any important project.