Inter Milan wearing last year's jersey?

[Cianfrocco]

Does anyone know why Inter Milan have been wearing last year's away jersey their last couple games? Their usual away jersey this season looks like this:

but the last couple games have seen them like this:

I know the red cross jerseys were worn last year as a retro style to mark their 100th anniversary, so why have they reappeared lately? Their latest game on Sunday, they even wore them at home (I know they are not technically "home" and "away" uniforms, but the change/clash/alternate jerseys are mostly worn during away games).