To me, there are two separate issues. The first is the couple trying to push their ideal of a gender neutral child on a real kid who has her own ideas on how she wants to dress.
The other is that it seems like her preferred outfits + 3 yo coordination are legitimately impeding her movement during some activities, possibly dangerously (like, I do find it a little disingenuous to act as if people regularly go hiking in evening wear... A suit would also be inappropriately restrictive). So I think this is something to address - pink, good; dresses, good; accessories, good but maybe floor-length/oversized puffy dress isn't for hiking and we go with a shorter dress or skirt (which also can be pink!). Basically, there are plenty of dresses that you can stomp around the forest in safely and maybe at three, it doesn't matter so much but idk, I think it's worth it to present some options irt princess-y active wear.
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The other is that it seems like her preferred outfits + 3 yo coordination are legitimately impeding her movement during some activities, possibly dangerously (like, I do find it a little disingenuous to act as if people regularly go hiking in evening wear... A suit would also be inappropriately restrictive). So I think this is something to address - pink, good; dresses, good; accessories, good but maybe floor-length/oversized puffy dress isn't for hiking and we go with a shorter dress or skirt (which also can be pink!). Basically, there are plenty of dresses that you can stomp around the forest in safely and maybe at three, it doesn't matter so much but idk, I think it's worth it to present some options irt princess-y active wear.