You need to completely cover it. In a perfect world a seed starter dome that would trap all moisture and allow you to slowly open a vent over the coming weeks to 'harden' it off to lower levels of humidity. (assuming the plant can survive lower levels of humidity, its a tropical plant and it might not)
In a less perfect world a bunch of plastic cling wrap you slowly poke holes into will work. But trapping humidity is a must either way.