When my sister potty trained my niece, she gave her lil one part of the responsibility. Proud of her task, my niece eagerly waited for the moment after she was done to put her pants back on.
Not able to differentiate front from back she was clueless at first, but figured out the right direction with a lil help from her mama. To see my sister's trick,
On the back of each pair of pants and panties, my sis drew a tiny heart so her daughter knew which side was for her tushy.
Do you have any similar tricks?