Protection against beads chafing arms.

This is a really good point - my dress also has beading under the arm area and we considered getting some removed to avoid them rubbing.

I would suggest using blistex blister stick - it's amazing stuff, any time I use it with new shoes they have never, ever rubbed and I swear by it. Easy to apply and goes on clear, it just helps create a barrier to avoid rubbing so imagine this will work really well with a beaded dress too! Boots sell it, not overly expensive and worth every penny!