PXC's bra extensions makes it possible to expand the back strap on your bra if it is too tight.

These are sold as a set of three (1 white, 1 champagne and 1 black)

PXC's bra extensions are available in four different sizes:

T5051 = 1,8 cm 1 row x 4 hooks
T5052A = 3,0 cm 2 rows x 4 hooks
T5052B = 3,7 cm 2 rows x 4 hooks
T5053 = 5,5 cm 3 rader x 4 hooks