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Content:
00:00 Introduction
00:58 First way to sew piping
11:22 Second way to sew piping
20:08 Third way to sew piping
25:17 Fourth way to sew piping

Piping is a trim that reinforces the edges of a seat cover or other upholstery items. Besides, it is a kind of decorative trim for our upholstery projects.
It was mostly used in old cars, but it persists nowadays as part of a car upholstery interior decoration.
I am showing 4 ways of attaching piping. Which one is the best?
The 2 first ways were usually used by car upholsterers. The first way, as we can see, consists in preparing beforehand a piping strip that would be then sewn down to the lateral panel. This lateral panel is then attached to the main panel. As a rule, generally the piping should be sewn down to lateral panels. As these pieces are shorter and straight it is easier to handle them over a bigger main panel.
The second way shows how the piping strip of vinyl including its piping cord is sewn down directly to the lateral panel. Next it is attached to the main panel. Upholsterers in the past used this method a lot.
As explained in the video one of the keys to prepare the piping strip is long stitches to avoid close holes that weaken the material. The tensions should be slightly loosened. If the tensions are too tight the material could shrink and form puffy areas.
The third way is faster than the former ones. As we can see, the cover is sewn down at one go. This method is generally used on plain car seat covers (foamed or non foamed). It is also used in furniture to make cushions or chairs' covers.
This method was used in the factories to manufacture bus seat covers. The mass production process needs faster ways to achieve tasks. Besides, the worker earned more money because the more covers the more money they received.
The last fourth way shows a kind of oversewing with a cording pipe enclosed. It is a fast way of piping generally for simple covers in cars or furniture.
In conclusion, if we would have to perform complex covers, the best would be to prepare the welting/piping, then correctly attach it to a lateral panel then sew it down to a main panel. It would take more time but it would be much better to handle and our sewing would be more precise because we have a predone line of stitches that are useful as a guide for our final closing sewing.
As shown in the video, for this demonstration I have used a piping foot. I would recommend getting several of them for different plastic cord thicknesses.
I hope this information is useful!

Cesar