ION, The 17th-Century Breastoration: A Time Before Bras
Option 1: Consult a Reference Work! You might turn to the Ladies' Dictionary. Published in 1694, here's the entry marked “Breasts”:
how to make them Plump and Round: Breasts that hang loose, and are of an extraordinary largeness, lose their charms, and have their Beauty buried in the grave of uncomeliness, whilst those that are small, plump and round, like two ivory globes, or little worlds of beauty, whereon Love has founded his Empire, command an awful homage from his vassals, captivate the wondering gazer's eyes, and dart warm desires into his Soul, that make him languish and melt before the soft Temptation.
That there's your goal. Now, what to do if you're saddled with large breasts whose beauty is buried in the grave of uncomeliness? The Ladies' Dictionary is here to help.
Therefore to reduce those Breasts that hang flagging out of all comely shape and form, that they may be plump, round and smaller, bind them up close to you with caps or bags that will just fit them, and so let them continue for some nights. Then take carrot-seed, plantain-seeds, aniseeds, fennel-seeds, cumin-seeds, of each two ounces, virgin's honey an ounce, the juice of plantain and vinegar two ounces each. Bruise and mingle them well together. Then, unbinding your breast, spread the composition plaster-wise and lay it on your breasts, binding them up close as before. After two days and two nights, take off the plasters and wash your breasts with white wine and rose-water.