I'm afraid the sleeves seem a bit too long.
我看这件衣服的袖子太长了。
We can have them altered.
我们可以改—改。
I would like my sleeves lengthened.
我想把袖子加长。
I need my suit altered.
我要改衣服。
It is too tight. I want to make loose.
这太紧了，我想把它加肥。
Can you change the buttons for me?
帮我把这些扣子换一下，可以吗？