Hi Rose,
if the textile is so fragile stitches are not appropriate, you can tuck a label with it in it’s box. If it can take stitches, you could attach the label with just one stitch to reduce any possible damage, choosing an accessible spot.
and if it is a costume on a hanger, you can put the label on the hanger instead.
and yes, asking someone with more skill than you feel you have is another good option.
best,
Sarah
