Alibaba is great if you're looking for custom products, but not all Alibaba manufacturers offer customization.
Some require that you order a ridiculous amount for them to customize or put your brand on the products you're ordering.
Others specialize in customization.
How would you tell these manufacturers or distributors apart?
Look for OEM.
If they will work with OEM or they offer OEM, you're good to go.
That means that they're used to rebranding.
Also, since you're thinking of working with Alibaba, another filter you need to apply is the initial volume.
Since socks revolve around personal consumer tastes, you probably would need to tweak the initial design several times before you come up with the design that is a hit with your intended audience.
You need a certain level of flexibility when it comes to volume orders with your supplier.
So the lower the minimum lot amount is for custom OEM jobs, the better.
Look for a distributor or manufacturer who can work with these terms.
Good luck with your venture.
It sounds amazing.
In fact, if you do new searches on people with socks websites, there's actually a story of a father with a son who is mentally challenged but make over 7-figures selling socks online.
The niche that you're in is definitely lucrative.
The market is there.
You just need to know how to sell, and of course, as we have discussed above, you have to find the right partner.
I wish you the best of luck.
Your project sounds awesome.