Ok, I adore pink but that outfit is TACKY!! Pink can be done in a cute stylish way and that outfit is no where near it (soft pinks not hot pink). I too hate frilly baby clothes and ones with writing on it - so cheap and nasty.
It's more of a concern that she is telling you it's a must. I would let her know that you will be the one in charge of the wardrobe! And, if she does give clothes like this then you can always donate them to charity.
No little boy should be dressed in an outfit like that, I wouldn't even bother discussing it with her as it's ridiculous. If she does buy it for you, say nothing and hand it on to charity. Just don't ever give her the opportunity to get him dressed, I never changed my nieces, its not an auntie's job to do that.
It's more of a concern that she is telling you it's a must. I would let her know that you will be the one in charge of the wardrobe! And, if she does give clothes like this then you can always donate them to charity.
No little boy should be dressed in an outfit like that, I wouldn't even bother discussing it with her as it's ridiculous. If she does buy it for you, say nothing and hand it on to charity. Just don't ever give her the opportunity to get him dressed, I never changed my nieces, its not an auntie's job to do that.