Gender neutral parenting can mean a few things, some of which I approve of, and some I believe are a bad idea.
For your suggestion of having your daughter wear gender neutral clothing I think that is fine so long as you allow her to express her own opinions as she gets older. It's entirely possible as she ages she will get annoyed that people keep guessing her sex wrong and request to wear less ambiguous clothing, or god forbid dresses (never understood why anyone would enjoy those, their just so impractical!). So long as you allow your daughter to express her opinion once she is old enough to I think there is no harm at all in keeping people guessing during her early life to try to minimize gender stereotypes.
In terms of trying to minimize gender stereotypes it also helps to ensure children are exposed to all types of toys, dolls, cars, a play kitchen, and play swords, at a young age without regard for what is a 'boy' or 'girl' toy. though again children will likely express an opinion on what types of toys they like very early on and once that is expressed it's best to focus on getting the type of toys the child prefers, even if it's gender typical. It doesn't hurt to offer a child a choice of other types of toys on occasion, to make it clear that they can enjoy those toys and are welcome to it, but respect their desires if they prefer 'girl' toys over 'boy' toys as they age.
I would say though I don't think this will do as much as you may think to combat gender stereotypes. Lots of gender stereotypes are learned by watching others. Since those gender stereotypes will still show up in TV, in adults of various genders, and in her peers your daughter will still be heavily inundated with gender stereotypes. I think gender neutral clothing helps a little bit, and is fine to try, but it's not going to magically do away with stereotypes sadly.
There are a number of other things you can do to help a child feel comfortable not having to comply with gender stereotypes. Expose them to many people who aren't gender typical (for instance when older 'Steven Universe' is pretty good show for this reason). In your play try acting out non gender typical play, such as a dad staying home to take care of the kids while the mom goes to work a STEM job (as a cis male I often ask to play 'mommy' instead of 'daddy' when kids want me to play house with them just to get young kids open to the idea that someone they think looks 'male' may be a mommy instead). Expose your child at a young age to the concept of trans individuals and other genders (For instance my honorary niece fully understood and was okay with the idea of trans individuals before she turned 5 after our conversation). I could go on with other examples, but I'm probably getting off topic now, a separate question could be asked about how to encourage children to not feel constrained by stereotypes where I could ramble further if you are really interested :P
I'm fully supportive of all the stuff above, however, when people say gender neutral parenting they often don't just mean something as simple as gender neutral clothing, but an explicit hiding of the child's sex. The difference being a refusal to tell someone a child's sex even when asked, and telling the child that they shouldn't tell anyone their sex either. I strongly advice against this type of parenting!
The difference between the two is that in the former, just giving the child gender neutral clothing and toys, you keep outsiders guessing at her sex without telling her what you are doing, which is perfectly fine so long as you respect her once she starts expressing an opinion. With the later you are telling your child that her sex is a dirty secret that must be hidden, and that is something you definitely do not want to do!
Children raised to hide their sex end up feeling that there must be something wrong with their sex or with developing a gender identity around it. This can lead to a number of issues very similar to what trans individuals go through with feeling that there is something wrong with their gender identity or sex or that their family and friends can't accept their identity. Studies show ultimately the vast majority of individuals raised gender neutral end up being 'gender typical', for all that effort their gender identity and how they view gender stereotypes wasn't heavily changed since they were still inundated with stereotypes through media and watching peers. However, children raised to hide their sex are more likely to say they feel guilty for ending up gender typical, as if it was 'wrong' of them to be stereotypical after all the effort their parents went to try to raise them to not feel they had to be stereotypical. The end up at the same result in the end, but feel far more confusion or guilt getting there!
There is also the lesser issue of bullying and individuals not understanding your goals causing trouble with you and your child for hiding the child's sex, which in an ideal world wouldn't happen but in real life is just an extra hassle that I don't think is necessary.
To address a concern brought up last time I made this argument I will say that if a child were to end up being trans that a gender neutral lifestyle is likely to be a preferable environment, and if you somehow knew your child would be trans when they were born you should raise them gender neutral. However, less then 0.5% of individuals will end up being trans. Given the fact that 99.5% of the time your child will be cis and thus just suffer from hiding their sex I think it's best to avoid hiding a child's sex despite the 0.5% chance it could help if they were trans. Without any way of knowing their gender identity when a child is so young it's best to pick the option most likely to help them feel happy and well adjusted, and I believe that does not involve hiding a child's sex.
By all means do everything you can to keep strangers guessing as long as the child is okay with it, but never tell the child, or through your own refusal imply to the child, that they have to hide their sex.