My reception PFB started off with 3 pinafores and 3 cardis. Did all the spot cleaning etc. But found it was a nightmare to keep her clean - she's a child and is mucky (as it should be!), so I got two more pinafores (£3 - £6 each) and 2 more cardis.
Everything is washed and sorted out at the weekend. On 5 hangers, there will be a pinafore, polo and cardi.
At bedtime, a uniform will be brought out of the wardrode and hung on door - so DH can find it in the morning (I leave dead early and all sorted). If by some miracle her uniform is clean, I'll hang it up and reuse it another day.
I've found it easier that way, no panic washes and its all sorted. I'm hoping that the two new cardis are the next size up and see her through to yr 1.
You have to do what's easiest for you - mind you I wouldn't have brought 5 pinafores if they were £30+ each