One thing to remember about NBE/HRT is when fat shifting occurs and your hips ass and thighs start to take on female secondary sex characteristics, your traditional male clothing will no longer fit and wear the same as it used to. Additionally, those who experience the "pelvic tilt" will definitely notice your old pants will definitely not fit the same.
I experienced the pelvic tilt around the 18th month mark during NBE, and my traditional male straight waist all of a sudden was angled about 25°. I struggled for the next many years until it got to the point where I just started buying only women's short pants, and they fit much more better!
I've held off ever since buying any women's jeans or slacks, but this fall & winter I'm going all in. Over the last several years I've accumulated a slew of women's shirts and shorts, and even with the shirts, they're flared at the waist to accommodate wider hips and they all just wear so much more better than men's clothing.