This is a tough decision for me. I am having twins, and my husband and i aren't sure whether to dress them alike, or differently. Twins are so cute when they match, but i want them to be individuals. We thought about themes. Like Winne the Pooh, disney, colors, etc. We also thought about them wearing the same thing, but in different colors.

If they are dressed alike, when is a good age to stop? They can't dress alike for their entire lives.

And what if they are boy/girl twins?

I know some people are completely against twins dressing alike, but i don't see the harm when they are young. And when they're old enough, i'll ask them what they want to wear. I know a set of twins who are going into the third grade, and the still dress alike, but they choose to.

I have twin cousins, both girls, non-identical.
When they were babies, my aunt received alot of matching outfits, but usually in different colours, so sometimes they dressed alike, and sometimes they didn't. If she was going out she would usually dress them alike, but in different colours, along with their older sister, who is 2 years older than them.
When they started choosing their own clothes, (around 2 years old) they very rarely chose the same clothes, and if they did, it was often just a coincindence. ie they wanted to wear a certain outfit, just because they liked it, not because the other was wearing it.
My aunt hated them being called 'The twins' as she wanted them to have their own personality, so even to this day when I hear someone refer to them as that I cringe. When they were babies we would call the by their names, or 'the babies', and along with their sister, they are usually called 'the girls' when referring to them.
They are now 14, and recently I was visiting when they came out of their rooms, dressed alike, and said "look Koby, we're twins!" I had to laugh, that even as twins, they had to dress alike before they called themselves this. After so many years of trying to develop their own personalities, all of sudden, they think it's cool to be twins, and are really emphasising this, especially among their school friends.
Sorry for the novel, based on my experience, I would say dress your babies alike if you want, it won't hurt them, (although be prepared for one of them to spit up as soon as you putting them in matching outfits...lol, happened all the time with my cousins)but when they are old enough to chose their own clothes, let them decide what they want to do.

One thing I want you to remember is that babies make messes. i have a 15 month old and I always have a change of clothes in his bag and I keep a couple outfits in my car just in case. You are going to be a busy mom and the matching outfits are cute for family outings and things but be realistic on how much time you really will have