Is that the edge of the apron at the left side when you are wearing it?

If so then it is not sewn in as part of the fell but is free from waist to lower edge.

There is a deep pleat beneath both aprons which gives easy movement to the wearer - should you happen to want to vault a gate or ride a bicycle for instance, and when sitting it allows the apron to fall between the thighs.

That deep pleat can sometimes roll out, (always on mine) and I counter that by pulling the inner fold up just very slightly, so a long narrow triangle of double fabric is cocked up above the top of the apron. It pulls the pleat into the vertical as it is contending with being a two dimensional fold wrapped around a three dimensional shape.

The A shape of the apron is created by an infolding of the edge of the apron, pushed in, not folded behind. The edge of the apron at the waist forms a W which reduces as it heads towards the lower edge of the fell. The point of the central /\ needs to drop down below the level of the top of the apron to allow that reduction - otherwise it would pull the infolding all the way to the lower edge.

It is easier to show these tricks than to describe them, but if you tack the folds and wrap the kilt you can see how the fabric tries to conform to the body shape.

Anne the Pleater :ootd: