I ordered several items from PatPat both for my daughter and lots of gifts for friends' children too. It was my first time doing so and I was quite disappointed. I still think PatPat has cute clothes but the quality isn't the greatest and the sizes are absolutely terrible.
I ended up having 1 month clothes that would fit only a 3 month old baby, or 3 month old clothes that were as big as PatPat's 6 month old clothes. The sizes simply do not make sense and I ended up having clothes that my daughter may not even be able to use since the sizes were supposed to match times of the year (cold/hot weather).
Customer service is non existent. I emailed in December, waited for a month then messaged them on facebook end of January. It has been another month by now and I still haven't heard back. The least they could do would be to acknowledge and apologise for the fact they're selling clothes that do not match the sizes they advertise.
I was very disappointed and would not buy from them again, my advice is that if you do decide to purchase from PatPat, be prepared not to have the right size you're looking for and don't ever expect them to reply and solve your problem.