There appear to have been user trials so fit and comfort has been considered, but there’s no more information about actual sizing, so I don’t really understand this knee jerk reaction.
Experience. The moment I hear 'unisex' my 5' tall, dumpy with plenty of curves to go around self knows that it's not going to fit.
By the time the trousers are going round my hips, the waist will be up to my armpits, there'll be a foot of fabric to take off the bottom, and the resulting trousers will be palazzo pants as someone says above.
Then the top will be inches too wide at the shoulders once it goes around my bust, and I'll be flashing everyone from the neckline and the armpits, it'll be ridiculously long, and have a load of extra fabric above/below my boobs (because no bust darts)