I agree with the advice above, plus, for the price of a Brooks, you can afford to experiment with a number of cheaper saddles that have different shapes, widths, and uses.
On my road bike I have a relatively hard and narrow saddle, since I know I'll almost always be wearing padded shorts. For my folding commuter like yours, I went with a thicker and wider mountain biking saddle because I'll almost always wear it riding street clothes.