Ah, nice. Thanks, Novocrane. If anyone else is wondering. Walking in Shadows sidepar on page 134 of Run Faster covers this.
On-topic, are there any official costs for UV treated clothing? As a houserule, I'd probably use counts-as Radiation Shielding or Fresnel Fabric and the rules for ruthenium polymer, so that each rating point reduces the severity of the allergy by Rating, adjusted for the amount of coverage provided as per the Errata.