Wow, these are long maternity pants!
Gap's Demi Panel Modern Boot Pants come in a 37" inseam! They're a dark grey, machine washable, and shouldn't shrink up you since they're made of poly, rayon, and spandex. The online reviews are (mostly) positive. Just under $65 and they ship for free. These also come in regular (33") and petite (30") inseams. Find more tall maternity pants at SearchByInseam.com.