Problem with replacing inner tube of old bicycle with tire code: 47-559 (26 x 1.75)
A 26 * 1.75-2.125, 47/57-559 tube should be fine for a 26 x 1.75, 47-559 tire.
Tubes can appear to be a little floppy and oversized on a rim before inflation. Remember the tube expands radially inwards and well as outwards as its cross-section diameter increases as it is inflated. Try inflating the tube a little before inserting it between tire and rim - this helps prevents folds and twists.