I've not worn the padded undies with dress trousers that I can recall...but I wear them with skirts, and more recently, bike shorts with skirts to counteract the Marilyn Monroe effect.

Under skirts that you can ride a bike in, you can't tell. Under jeans and chinos, you can't tell. I've just never tried with office-type clothing. One tricky area is the waist, as in matching the height, or rise, of the shorts to the clothing.

Both methods have been really effective and helpful.