"These are my first pale gray shoes."
Translation:Ce sont mes premières chaussures gris pâle.
Why doesn't the term "gris pale" reflect the feminine plural agreement with "chaussures"?
Good point, this is one of the most difficult set of rules of French Grammar: Color adjectives. One rule is that a compound color adjective doesn't agree in gender nor number (chaussures grises, but chaussures gris pâle). It's because pâle is an adjective describing gris; the gray is pale, the shoes are not. In this case, the historical construction was chaussures d'un gris pâle ≃ shoes colored with pale gray. Therefore, the aforementioned rule.
I searched on Google if there was any grammar rule about that in French, but I have found nothing. Although, I thought about it for a moment, and here is what I think.
In French, you often write what qualifies a word after it. This is why most adjectives are after nouns. For instance, "a black cat" (article + adjective + noun) in English is translated as "un chat noir" (article + noun + adjective) in French.
This is the same with compound colour words (I do not not how you call them in English): first, you have the adjective, and then you have the word that gives a little nuance to it. This explains why "pale gray" (adjective describing the colour + colour) in English is translated as "gris pâle" (colour + adjective describing the colour) in French.
I do not say that this is necessarly why this is like this and that it applies to every compound colour words, but I think that it may help you to know that. If you did not understand what I said, feel free to ask me to rephrase my comment. I am still learning English, so I will not be offended if you ask me to do it :)
The shoes aren't both pale and grey (pale, grey shoes), they're pale grey (a single colour: pale grey shoes). Adjectives in French usually go after what they're describing, so "pale grey" becomes "gris pâle".
Can anyone help on the order of "gris pale", and why not "pale gris" please? Is it fixed to always have pale after the true color, or there are conditions?
You may want to read my reply to wyt230143's comment above. In short, I did not find any grammar rule for that, but I wrote what I think about it as a native French speaker :)