This is often referred to as


This is often referred to as “moire,” defined by Webster as “an independent usually shimmering pattern seen when two geometrically regular patterns (as two sets of parallel lines or two halftone screens) are superimposed especially at an acute angle.” We can’t see the patterns within your red circle very clearly, but my guess is that the shimmering is coming from fabrics with intricate patterns too complex for the camera to resolve.

There really isn’t anything you can do to fix this in post as far as I know, although you might try adding a very small amount of blur to this portion of the shot. In shooting, be aware of this effect and avoid materials that cause it.

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