I Still Haven't Come Up With A Solution (Updated)

Back when I was talking about "tailor's swords" I was referencing this video:

Lots of swords are less than ideal for fighting, and many serve social functions or as badges of rank.

The thing about several examples in this video is they are not poorly made with regards to strength or durability.  They are poorly made in that they are difficult to put to work.

They should get a skill penalty.

There's no methodology for that in the rules as written. 

Update: 

Daosus in the comments reminded me of the Poorly Balanced option on page 59 of Low Tech in the Weapons of Quality box.

But it's just a -1 to skill for a 60% price cut...  Actually a -0.6 cost factor, which is it's own little trial of remembering simple math.  You multiply the base cost of the weapon by 1+(add up all the cost factors) as explained on page 14 of Low Tech.

So a poorly balanced and elaborately decorated rapier with an open basket hilt...

$500 for the base rapier.
CF -0.6 for poorly balanced.
CF +4 for "presentation quality" decoration.
CF +0.25 for the basket hilt.

$500 x 1+(-0.6+4+0.25)
$500 x 1+(3.65)
$500 x 4.65
$2,325

This is surely a weapon that you wear to impress people and not one you use to impress an opponent in a fight.

The tailor's sword, I think, can be made with going poorly balanced (-0.6), cheap (-0.6), open frame basket hilt (0.25).  It's basically a short sword ($400) to start with...

Since the modifiers drop the price below 20% of the original price, it's 20%, or $80 for our tailor's sword.  If the tailor is being honest, and I get the impression that they weren't.  The tailor probably would have sold it for the full $500 that an open frame, good quality, short sword should cost.  Caveat Emptor, Bitches!