The difference between business casual and casual dressing can be night and day. But, if you’re packing space is limited or your schedule too packed, you may want to consider a pair of these very useful and comfortable trousers: flannel “jeans” as they are suitable for just about any occasion, depending on how you wear them.
Dressed up with a sportcoat and sweater, or shirt and tie, they look the part of “normal” flannel trousers.
Take off the sportcoat and add a leather jacket or stick with the sweater and you’re wearing five-pocket jeans cut from the softest fabric ever. Perfect for travel when you have to look presentable, but have to be comfortable.
If I recall, they come in black, too. Available through my tailor, Leviner Wood, in a number of waist sizes (although they are no longer available as custom garments, they are well worth it!) I love these.