It is no issue if we want to buy our own shoes in any country because we can always try it first. The question are when we want to buy for family, friends and our children. If you noticed in Malaysia, the shoe size is always single digit number like 5,7 or 8. Sometimes you can get 7.5. Then there are imported shoes with double digit number like 41,42 etc..
Adults size 5 is different from children size 5.
So you can refer to the Internet for International shoe size chart. But to proper and more accurate use of the chart you must manually measured the foot. So watch the video on how to find proper shoe size. Then you can ask your family / friends to send the size by text msg or email to you.