I was reading the AD&D DMG this weekend & ran across the ruling for Enlarge. When you cast it on a creature, only the enlarges. "All garments and equipment worn by a subject of this spell should be considered to automatically drop off ... split away during growth..."
The enlargement is also 10% per level of the caster up to 200% max.
Good thing we're not playing AD&D here - I don't think a naked 6'5" Burin with a 'toy' battle axe would be nearly as effective!