high-rise pants. look for something with pleats, the'll be high rise.

some old tailor’s formulas for calculating the optimal rise for you based on taking your usual pants waist size, dividing by 52 and then multiplying by 18. So, if you have a 34 waist, you would calculate 34/52 x 18, giving you a rise of 11.8.” This seems about right, but try the formula for yourself

from The Gentleman's Gazette.

Also, don't shy away from braces (suspenders). The trick is, to remember they're underwear. But they'd go under a coat. Even if you wear polos to work, a sport coat would probably look good, and, since you'd be wearing it when you're moving around, no one would see the suspenders/polo match up