So I had a conversation on this in a different community. I’m going to summarize my conclusion here.

Sadly the flag code defines the flag as having a singular blue fied.

I tried to get a good definition of what exactly a field is. Here we have the definition “The backdrop color to a flag. Ex: On the Arkansas state flag, it is the red part.”

I’m not actually finding a better definition and am starting to question if the canton in the US flag counts as a field in vexillology terms since it isn’t a ‘backdrop’.

A better way, and perhaps the more accurate, is to ask how we would construct a flag. The red field in the Arkansas flag is one piece of fabric. The blue canton is one piece of fabric. Two blue stripes could be once piece of fabric with everything else sewn into of it. But I think the better construction would be two pieces of fabric sewn on to the outer two stripes.

But I wouldn’t worry about it since section 5 codifies “existing rules and customs pertaining to the display and use of the flag of the United States” by using an existing executive order. That order’s attachment basically defines the flag as you know it.

Of course none of this is actually has a mechanism of enforcement so you can fly just about anything and just call it the American flag.