Tall girl with twins

I'm 5'11" with a long torso and at 26 weeks my maternity shirts are already riding up and letting my belly hang out the tiniest bit.  There's still 14 weeks of twin growing to go and I don't think there will be shirts long enough to cover me!  I tried on what I thought to be a dress at Target the other day and it looked like a tunic on me! Barely covered my bum!  Any other tall mammas having trouble with clothes? As if finding long pants weren't hard enough!