Kids' School Uniform Jersey Polo Shirt vs Boys Classic Fit Flat Front Pant: which is safer?

Where these two actually differ

• We flag Azo dyes and excess dye residue and Microfiber shedding and microplastic persistence on the Old Navy and not on the Dickies.
• We flag Azo dyes and colorants, Antimony in polyester, Heavy metals in dyes and pigments and Residual solvents or sizing agents on the Dickies and not on the Old Navy.
• The Old Navy is cotton jersey knit where the Dickies is cotton/polyester blend, no special coatings, which is most of the difference in these two grades.
• These two are level, close enough that price and fit should decide it rather than our grade.