Congrats on your new ride and welcome back to biking! I can tell you have good taste as I also ride a black Trek (7.3 FX).

As previously stated "they are popular for a reason". I really enjoy mine and I hope you and your daughter make many wonderful memories on your rides together. I also understand your initial reaction to bike shorts but you may find yourself considering them sooner than expected after more saddle time… that's the way it worked for me anyway.