h&m denim midi dress H And M Short dress in sturdy cotton denim with rhinestone trims Denim Flutter-Sleeve Midi Dress in
Description
Here is that part of the dress (cropped), it should appear a dark bronze on its own: I used a color tool to identify the exact color
However, this is only a partial explanation and does not explain how two people viewing the same display might see the dress differently [which apparently does happen], he added

If we were in that physical space we would know what the lighting is on that particular dress

They need to be found and studied in labs

The black-tie dress code and its variations: The black-tie dress code is a formal dress code typically required for events such as weddings, galas, and other formal occasions

In their survey, Conway and coauthors Rosa Lafer-Sousa and Katherine Hermann of MIT found that women were more likely to see the dress as white and gold and that the odds of seeing the dress as blue and black decreased with age