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I suggest decal strips.

Check out an architectural supply. What you're looking for is something on the order of Chart-Pak or similar graphic arts tape. Graphic arts tape in varying widths is designed to follow curves, some of them fairly tight. Staples carries black Chart Pak as narrow as 1/16", but I used to see it in artist's supply shops as narrow as 1/64" which is almost too narrow to see. Hope this helps.

I think you're on the right track using a strip of "something" to replicate the sewn fabric seams......The picture may a bit misleading since it's a close-up shot and makes the tape you're using look even more out of scale; but I think since YOU sense it's "too much", it is too much! What you're doing works really well in 1/48 and larger, but is probably a bit heavy handed for 1/72. Michael's idea of using decal strips could work... provided you have a set of stripes that you know are on the thick side. However, the problem with using decals is that they're actually designed to blend in and disappear under a coat of clear paint, so you risk your efforts being wasted. The only "tape" I can think of that has the thinness needed for 1/72 is plumbers tape. IF (and I say if because it is hard to handle without tangling) you could peel off a strip and get it laying flat on a hard surface (glass, tile, countertop, cutting board, etc.), you might be able to cut a thin strip and press it in place on the model. This might give you the very slight height difference you're seeking by using tape. A coat of paint would seal the strips in place. Short of that, you can simply resort to faking it by painting the strips, making them a slightly different tone. You don't get the actual "step" using paint...but then in 1/72 that may be enough to carry off the effect. Perhaps someone else will be here shortly to offer a better idea. Til then, hope this helps! Gil