help in identifying this pleat in the photo

[perfection]

This is a manual (not fabricated) pinned table skirting that we teach at our hospitality college - could you help identify by what correct name this pleating should be called?  I am referring to the vertical falling pleats NOT the petal like indentations atop the individual pleats










Also here
https://i.ibb.co/VLQ4dr0/skirting.png

[Gerry]

It's similar to an inverted pleat:

https://www.pinterest.co.uk/freeman3122/inverted-pleat-curtains/

[perfection]

Thanks Gerry
Could these or are these ever referred to as (an array of) accordion pleats?

[Gerry]

They're not accordion pleats. Those would be triangular. You have a 'flat' between each pleat, which is no different than inverted box pleats, only without the crisp, pressed edges.

https://byhandlondon.com/blogs/by-hand-london/26070276-the-world-of-pleats-explained

[Hendrick]

I believe they are called "cartridge pleats"...

[Schneiderfrei]

Cartridge pleats do look very like the thing, although there is still a gap between each pleat in these table setting pleats.

also called Gauging:

https://historicalsewing.com/how-to-sew-cartridge-pleats

G

[Gerry]

Well done Hendrick, looks like we have a winner:

https://www.sew-helpful.com/curtain-lined-cartridge-pleat-index.php

The name makes total sense: nothing square/boxy about those pleats, and they do resemble shotgun cartridges. OK, a bit of a gap between each pleat, but it's a 'variation'? Plus the gapping is more prevalent at the top (pleats become more cartridge-like down the drape).

[TTailor]

They are a variation of cartridge pleating?
Cartridge pleating is usually more evenly spaced and these have overly large spaces in between the « pleats »

[posaune]

https://www.youtube.com/watch?v=zaGTBSfpbmY
Is this what we are talking about?  Is this used just once? How do you clean it after use?
lg posaune

[Hendrick]

I remember a couture skirt by, I believe it was, Cardin with this kind of pleat. It looked like fluttering bookpages, very beautiful...