I'm looking for barrel denim pants that are comfortable to wear when going to lectures.

There are no denim pants confirmed to have a barrel fit in the current materials. Instead, I've selected loose-fit and semi wide-fit denim that are great for comfortable wear. The two denim pants from LOW CLASSIC are 100% cotton loose-fit styles with a soft wash, and the THREE TO EIGHTY item is a semi wide fit in a light blue wash.

I've selected three pairs of denim pants in wide and semi wide fits. The LOW CLASSIC items are wide-fit styles with a soft wash, available in indigo blue and black colors. The THREE TO EIGHTY denim is a semi wide fit featuring a light blue wash with contrasting stitch details.

I've selected wide and semi wide denim pants confirmed to have a 100% cotton outer shell. The Pocket Wide-Leg Jeans in black you saw earlier was excluded from the candidates because it is a 66% cotton blend. The LOW CLASSIC denim comes in wide and semi wide fits with a soft wash, and the THREE TO EIGHTY denim is a semi wide fit with contrasting stitching.