[Lord Brass]

The way it should work is, that you continue with your previous abilities (stuck at the level you changed at) which you can use as before. That means no plate armour, if you want to cast spells (or shapechange probably) as a druid. As to weapons, you should be able to use them, but you may find that your new abilities are "turned off" until you remove the offending item e.g. like unequipping a longsword you put into your character's hand. I think that's how it works, as to be honest, I don't bother with dual-classing much. It's sort of okay for BG1, but for games were you can actually gain some decent levels, I prefer to take the time with single or multi-class characters.