This is how Aladdin costumes have changed over the years.

Picture Year As seen at Notes
November 25, 1992 - September 5 / October 2016 Based on his street rat appearance although with an extra light yellow shirt.
2015, September 5, 2016 - present Aladdin sports his outfit based on Prince Ali though with a smaller hat with no extra cloth. This costume actually debuted in Disney's D23 Expo in Japan in 2015.