There are no 1.5 stripers w/blue shirts...
Here's the skinny:
White Shirts = Students
(stripe #'s and meaning previously posted are correct.)
none=presolo
1/2 (skinny) stripe=soloed
1 stripe=private single
2 stripes=private multi
3 stripes=commercial multi
Blue Shirts = Employees
1 stripe = flight instructor in training (new hire/non-standardized, ie; not flying the line)
2 stripes = standardized line flight instructor
3 stripes = asst. group leader, check airman, standardization instructor or program manager
4 stripes = ground instructor (academic side); assistant chief flight instructor, chief flight instructor always a check airman, usually a standardization instructor and/or a program manager
Wing symbology (same for employees and students):
plain wings = student pilot or rated pilot (non CFI)
wings w/star above shield = rated pilot w/CFI
wings w/ star and wreath around star = ATP, ground school instructor, asst. chief flight instructor or chief flight instructor
Hope that clears it all up....most of this is directly from the student/instructor handbook, plus a little from experience...for the exceptions.......