I would like to know "Per una....." what? Where is the noun? Una is an article, not a "thing". Will check that once DH gets out of bed, but it sounds funny.
And also, why the Italian(ish) name when the bulk of the clothes do not look like that would really take off here?
Is this an oh so ironic pop at the slight issue of "always add one bad accessory" that Milan appears to be plagued with ?
So instead of having to add one bad accessory by yourself, M&S liberally litter your clothes with several bad accessories, saving your good self the time and bother of working out which thing you own that goes least with your get up ?