Even though I'm female I don't wear dresses🙂
But saying that there are verious metbods one can implement to wearing dressing, from wearing a hoister around the leg or arm, you can get a pounch that clipes to the bra strap at the side so the pump sits under the arm.. Some plonk their pump in their cleveage! You can also just hang it around your neck..
It may be worth considering when you looking at what pump to choose, and going for one of the one with a remote to it, such as the Spirit Combo (the one I use) or the new DanaR that's just come out, I'm not 100% sure but the other pumps don't have a remote handset as standard, but a few you can get one at an extra cost.. Or another alternitive is the Omipod which is a tubles insulin pump with remote, Rouche is apparently bringing out a tubeless pump at some point during this year..