When i stand for any length of time, i find that my hips start feeling numb. what could this be?

It's interesting that the numbness occurs in both hips. Prolonged standing apparently compresses sensory nerves in your hip areas. If this is the only occasion where this numbness occurs & it's purely positional, it may not require investigation or treatment, but weakness of muscles would & such damage is to be avoided. An orthopedic specialist or a neurologist should be consulted as needed,though