Answer: monogram

AnswerCrossword Clue
MONOGRAM

GBS,.LBJ, or MLK

MONOGRAM

Personal letters

MONOGRAM

LBJ or JFK

MONOGRAM
Clothing embroidery, maybe, and a hint to finding the "insiders" in the answers to starred clues
MONOGRAM
Initials.
MONOGRAMSet of initials.
MONOGRAMShirt adornment.
MONOGRAMIdentifying letters.
MONOGRAMInitials
MONOGRAMH.S.T. or D.D.E.
MONOGRAMHandkerchief marking
MONOGRAMFeature of some stationery
MONOGRAMLetters on stationery, perhaps