This pyjama top was made by M&S in 1993. Its sett is small, and it is part of a series of nightwear that also includes a nightgown. Mairi says:
This is a really baggy pyjama top, made from thin shirt-weight cotton. Both it and the pyjama bottoms that go with it fit weirdly, and the fabric is the same as the nightshirt made the same year.
Threads of Belonging 