This is the 8952nd most frequent Korean word.
같아서
"같아서" means "because it is similar" or "since it is alike."
같아서 is used to indicate a causal relationship where the similarity (being the same) between the two clothing items' colors is the reason for the confusion.
이 옷과 저 옷은 색깔이 같아서 헷갈려요.
These clothes and those clothes are confusing because their colors are the same.
같아서 is used to express the comparative feeling of the weather being similar to spring due to the warmth.
날씨가 따뜻해서 봄 같은 느낌이 들어요.
The weather is warm, so it feels like spring.
같아서 is used metaphorically to describe the vivid memories giving a dreamlike feeling.