What type of welt cord works best for slipcovers? My favorite is medium-firm polyester in size 5/32. This cord (above) has a poly tissue-like core and wrapped with a braided cover. Here’s why I like using it for sofa, chair and ottoman covers:
- Firm enough to keep its shape yet soft enough to bend around curves smoothly
- Doesn’t shrink or pucker when you wash your slipcover
- 5/32 size is ideal for slipcovers and the slightly smaller 4/32 is good for pillows
Online upholstery suppliers often carry this type of cord, too. Tip: sample before you buy. I recently purchased 500 yards of “polyester welt cord 5/32” from an upholstery supplier and I was very disappointed with the quality. The 5/32 size was wimpy and the core was mushy and flattened quickly. Now I know not all poly welt cord is made the same way.
Avoid using cotton welt cord (left) for washable slipcovers. The cotton fill is a bit lumpy and loosely covered with fishnet. Another type of cotton welt cord is twisted like a rope. Either way, it’s mushy and flattens easily. Watch out, this stuff will shrink!