This is a continuation of To pin or not to pin so you should read that first if you haven't already. I.D. and O.D. refers to Inner Diameter and Outer Diameter. This is a common concept in every field of engineering of which sewing is one. However, it's only in sewing that people assume that two lengths that will be joined must be identical in length. In any other field, one would be laughed out of the room for believing this. I.D is necessarily smaller than O.D., one tucks inside the other. That's just one reason that sleeves -for example- should not be larger than the armhole to which they are sewn. Sleeves are I.D. tubes sewn into a still larger armhole tube (O.D.).
Using exactly the same pieces from the previous entry, I sewed two tubes as one would in the course of attaching cuffs or inserting sleeves. Below you can see the result of using the improperly cut lengths inserted inside each other.
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