There are several factors that affect utilikilt vs kilt, but the key differences (that I am aware of) include:
- Traditional kilts are a wrap of a length of cloth whereas utilikits are usually like a skirt
- Utilikilts usually don't have the requisite pleats in the back
- Utilikilts are often in plain, solid colors whereas a kilt is made of tartan
There are more, but those are the three key ones that I am aware of