What "casual" means seems to depend upon the kiltmaker. From what I have seen, if the kilt is designed to sit lower than the natural waist it gets belt loops all around. B&S casuals are traditionals with less fabric, designed to sit at the natural waist, so they have the large rear loops only.

This is logical, since if the belt goes at your natural waist, as it does with a traditional kilt, it should stay where it is, as should the kilt, even without a belt. While if it is below your natural waist, it will want to slide up off the kilt to your natural waist, hence belt loops are require to keep the kilt up and the belt down.

Of course all of this assumes that your waist is sufficiently smaller than your hips. I tend to have to hike up my kilt and adjust my belt several times a day. On the kilt belt I assembled, I put self stick velcro (loop side) round the inside. It really helps the belt require less adjustment on the front of the kilt. I also put hook side velcro in the sporran hangers I made, so I they stay put on the belt.

A fine looking kilt, by the way. I have a Modern Scott Red B&S Casual. They are an excellent value.