How To Create Clothing Items Model - Different Sizes for Shoes, Shirts, Jeans ect

Im creating an online retail store.

Just wondering how some of you professionals would go about creating a Clothes Model.

Problem Shoes have different sizes like mens 8,9,10,12 ect. Shirts have 38,40,42 chest. Jeans have 32, 34,36. Dresses have size 6, 8 ect.

How would someone go about making an clothing items model. So when someone creates and item, they first click on which category they want. Lets say Shoes, then it brings down a list of shoe sizes and you can then put in the quantity for each shoe size you have and all other attributes like price and ect.