As a clothing style it seems to be kind of “casual punk”. The clothes are more akin to everyday clothes. Then again, holes in clothes are used more than in “traditional punk costume”. Some crust punk people radiate a feeling of being kind of part hipster, part punk.
Wikipedia has a good article about crust punk.
As a music style it’s a mix of punk and metal.
As a clothing style it seems to be kind of “casual punk”. The clothes are more akin to everyday clothes. Then again, holes in clothes are used more than in “traditional punk costume”. Some crust punk people radiate a feeling of being kind of part hipster, part punk.