The dress code limits the freedom of expression for some students, but the dress code establishes an appropriate learning environment for everyone by reducing distractions, to begin with. All schools require at least some sort of control over what students should wear within the bounds of a dress...
granted PR (two officers in a small interview room for around 1.5 hrs if I remember correctly. Even then, while the issuance of PR was a go down to the ICA building, there was not any formalities as you aren't giving up anything. Bit different when giving up your former citizenship. ...