Those who want too excuse themselves for how they dress will always answer back with an arguement or question – this is usually done when there is no other answer to offer.
Jeans or no jeans – those who wear jeans will always have an answer or argument as a reason why they wear jeans. Saying they are for building, decorating and other such work is not acceptable as there are plenty of other fabrics suitable.
If you wear jeans just say you wear them because you like them, don’t give an explanation. They are not appropriate attire for religious people as they are a garb of non Jews but hey if you want to wear them go ahead just don’t go on the defense.