When i build my armour i am going to use whatever size joining strips are needed so that the armour fits me, my AP suit was tight and the normal size strips.
If i am able to use the recognised sizes then all well and good, if not im going costum.
If thats the case i will also make the rear closer the largest trying to keep the front as close to the 15, 20 and 25 sizing as mostyl people veiw you from the front and the back is not so important.
Is this is clear as mud?