Do not check the length only barefoot
Pale suit trousers can suddenly become too long when you switch from heels to flats. Try them with the pair you actually intend to wear to the appointment. White open-toe heels can coordinate with a pale suit, but colour harmony does not solve a length problem. Stand normally, then walk a few steps. Do not pull the waistband higher than you would wear it during the day. If the hem works only in that raised position, its length is not yet reliably suited to the way you will use the trousers.
Look at the hem from every side
Check the front, heel and side opening around the shoe. Trousers can look tidy at the front while still falling beneath the sole at the back. If useful, ask someone to look from behind while you stand normally. With open shoes, fabric should not slip between your heel and the shoe either. A small professional alteration can help more than holding the hem up continually. Mark the desired length with the intended shoes on, considering whether you will mostly wear this pair or others of a similar height in future.
Account for the journey to the appointment
For a short dry journey, the same shoes may work from departure through the appointment. Wet streets or a long trip call for different planning. If you want to change shoes, the trousers should already work with both heights, or you can transport the suit separately and change at the destination. Avoid improvising by tucking hems into open shoes. A neutral bag can carry the spare pair without distorting your jacket pockets. Choose the practical arrangement for the whole day rather than only for a brief moment in front of the mirror.
