Seven Brides for Seven Brothers (1954)

During the part where the girls are in period undergarments (of that time), you can see some cleavage at different parts throughout them talking, dancing, and interacting while in the boys bedroom. And during the part where the brothers are wrapped up in blankets, one walks in the dining room with the blanket barely covering his thighs and the second oldest brother's shoulders are visible outside of the top of the blanket. Otherwise, it is a decent and clean movie.

This is set in the 1850's and has all the morality inherint to those times. (ie: No nudity or sex) There is one section where the girls dance in their underwear, however, as befits the times, this is pantaloons (to the knees) a chemise (short-sleeved top) with an underbust corset. There is no 'shape' to the breast area, nor is any of the clothing tight or revealing (other than the corset area being tight, but that isn't revealing at all).