Hello, the site is legit but I recommend you not purchase off it. You're paying a lot more than you should be.
I have a few sites that I've purchased off before and I hope they can help you in finding the authentic kawaii clothing/goods you're looking for.
Milk Teas shop
Shop Magic period
It's definitely not worth your money. You can purchase cheaper items off Aliexpress with the right keywords - I've compiled a list on my video review of the store (thiccvic on YT, search SO AESTHETIC).
The items off Aliexpress have a lot of reviews and many people who've provided feedback tend to provide images as well. Good luck shopping, and you're welcome for saving a few bucks.
[PS: SoAesthetic tend to sell their products that are bought straight off Aliexpress 2-3 times the average price if you find it off Aliexpress.]