It's easy to not notice, but at the same time it stands out like a sore thumb.

After their capture of Poison Ivy, Batman, Robin, & Batgirl go after Mr. Freeze wearing nifty silver trimmed costumes. -So.-

They save Gotham, they capture "Freeze", and Batman gets the cure for McGregors Syndrom Stage One, to save Alfred. -Nothing wrong so far.-

Now, the scene at Alfred's bedside; Barbara is wearing a sweatsuit (ok), but Batman and Robin (though maskless) are back in their original (nonsilver trimmed) costumes. How?