Ibex is supposed to be coming out with a seamless camisole soon.

Smartwool has a tank-top.

Someone had a link to Icebreaker camisoles and undies.

<Knot goes to look for links>

Icebreaker tank top: http://www.backcountry.com/store/gro...ml?id=GRbK5xtX

Icebreaker camisole: http://lonelyplanet.altrec.com/shop/detail/30921/

Smartwool tank: http://www.teamestrogen.com/products.asp?pID=26644

Ibex tank top: http://www.ibexwear.com/shop/Product...ies-Sleeveless