Can I change a wasteland explorers equipment?
Solution 1:
Without recalling the explorer, no. Sometimes an explorer will change into an outfit they find, or equip a weapon they find, if it's better*, but this is fully automatic. They'll still bring back their previous equipment.
*Better doesn't always mean what you'd choose. E.g. an explorer will swap out their rusty laser (7 damage) for a 6-8 damage sawn-off shotgun they find.