I think hardly any people will notice if one is wearing the attire that is normal in the location unless one acts suspicious...
Hm...it depends if bro chootchiew has a "tak chek" look or not. If you are a doctor, surely you will exude a "wu tak chek" aura. If his demeanour is like Mark Lee with a "last in class" or "stay back" look, then sure kanna IMH observation.