The characteristics of the slim fit style are:-
No placket
Smaller pocket
Fitted form with rounded bottom 
Available across price points
No pleats at the back
Has red labels, hang tags, band roll and a black and red tag above the main label under the collar which says “Slim Fit”

“Features of Tailored Fit”
No placket
Smaller pocket
Round bottom
Slimmer sleeves
No pleat at the back
Has a black and silver tag as well as a black and gold tag based on the make up of the shirt above the main back label under the collar, band roll and collar band which says “Tailored fit”

“Features of Classic Fit”
Has a Placket
Standard pocket
Straight bottom
Generous sleeves
Pleats on the back of the shirt
Has a black and gold tag above the main back label under the collar, band roll and collar band which says“Classic fit”