I think if you’re going or coming to work and you wear jeans to work, then it would be acceptable, b’d’eved.
But, otherwise, it seems disrespectful to me to come so casually dressed (and certainly not in rumpled/soiled white shirt; jacket; slacks) to G-d’s house and to beseech Him in prayer (it only takes a few minutes to change from casual/comfortable to appropriate attire).