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1. I want my son to wear the same clothes as everyone else at the school.
2. I want my son to wear the same clothes as everyone else does at the school.

Q1) Are both sentences grammatically correct?
Q2) Do both sentences mean the same thing?
Q3) Can "does" be omitted from sentence 3?

My answers are yes.

My dictionary lists the first one only, but I'm not sure about 2.

Comments  
fire11. I want my son to wear the same clothes as everyone else at the school.2. I want my son to wear the same clothes as everyone else does at the school.Q1) Are both sentences grammatically correct?Q2) Do both sentences mean the same thing?Q3) Can "does" be omitted from sentence 3?

From an audible perspective, both sound correct to my ear. Grammatically, they are not wrong. That being said, I feel "else" is a filler word. That's my opinion. We can express a similar idea in different ways and constructions. What matters is, it ideally should be clear and concise.

fire1Q1) Are both sentences grammatically correct?

Yes.

fire1Q2) Do both sentences mean the same thing?

Yes, but in your question, "both" and "same" are redundant.

fire1Q3) Can "does" be omitted from sentence 3?

I don't see a sentence 3.