What is the purpose of 了in this particular sentence? I came across these sentences in HSK standard course 3 and I can't understand why 了 was added after 大. My translation of the sentences is this: "爸爸的生日快到了，我想送他一条裤子，你看这条怎么样？ 颜色不错，但是我觉得大了一点儿。" "Daddy's birthday is coming up soon, I want to give him a pair of pants, look at these ones, how about them? The color isn't bad, however I think there's a little bit too big". I'm guessing that my translation is slightly inaccurate at the end, because I don't account for the fact that 了 appears after 大.