In fact, I'm struggling to think of a really top-class international side who play in red.

all i can think of is England 66, portugal got to the final of the last euro's in red, ummm.... Denmark wear red for thier 92 success ?

the best international sides are yellow and blue, i would say with clubs sides success breeds success though so a little helping hand from a red kit can make a difference over years and years, whereas a slight improvment internationally because of a kit can't add up over the years only give a slight improvment on the day (i suppose it could help slightly over the years, but previous success to look up to isn't as valuable as previous success to look up to and spend on players)