It may be that you are seeing the same thing I sometimes see, which is that the canvas interfacing *beneath* the aprons is puckering because it gets creased when I sit down -- especially if I've been driving.
The crease in the interfacing causes the lighter fabric of the aprons to "pucker."

Originally Posted by
NeighborhoodKiltGuy
Descended from Patiences of Avoch | McColls of Glasgow
Member, Clan Mackenzie Society of the Americas | Clan Donald USA
"We have this hope, a sure and steadfast anchor of the soul." (Heb. 6:19)
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