The Dress in question: The Rose bouqutnya jumper skirt
They didn't use some fail internet translation tool either. None of the other items appear to have the dual description yet.
I personally like this way a lot more than them doing another English website.
EDIT: This was on the main page this morning -
★Notification about the explanations
of the items for overseas customers★
The explanations of the items in English is added to the item page.
We hope thta (that) it'll be useful for overseas cstomers (customers).
Thank you for supporting us.
And they've updated most of the other items too! Looks like it's here to stay.