Imagine for a minute a player asks the perfectly reasonable question of “Can I remember what colour her eyes were?”
What I have always done in the past was ask for a skill check using the characters Memory stat bonus as the skill bonus.
When I moved from RM2 to RMC and the threshold for success went from 101+ to 111+ for most casual stat based tests success required an open ended roll. If that was reasonable 19 out of 20 trips to the shops for me would probably end in chaos and that could not be right. For me 1 in 10 trips to the shop ends up with me bringing home the right thing.