Kids in matching clothes. I never got it. I would always silently judge and think 'they are individuals, stop dressing them as clones'. Especially with twins.
and now I have DS2 who idolises DS1 and wants to be just like him and that includes the clothes they wear. this is a 2 way thing, DS1 asked me at the weekend "What shirt is DS2 wearing so I can wear the same?"
And then DD (DS2's twin) feels left out and wants to wear the same. So if DS2 has his dungarees on DD wants her dungaree dress. If DS2 is wearing his red trousers she wants her red leggings. They always looked like I have deliberately dressed them as twins!
So today (DS1 is off school sick) I have all 3 DC in jeans with blue and white striped tops on at their own insistence. They look like little clones!!
So sorry to all those who have been before me, I have seen the error of my ways!! 
(incidently, those with 2 or more of the same gender - how do you chose who gets what new things? for example I saw a great dinosaur top the other day and couldn't decide who to get it for - DS1 or DS2 as they both love dinosaurs! but I cant quite face buying them the same clothes all the time, plus its a pain when sorting laundry in a hurry to know who's is whos!)