In Brian Mathew's Crocus he describes Crocus thomasii as follows:

"Flowers autumnal, fragrant 1-2(-3), pale to deep lilac, generally not
strongly veined darker but sometimes veined or stained towards the base
of the segments with violet; throat pale yellow, pubescent. Prophyll
present. Bract and bracteole very unequal, white, membranous with long
tapered tips. Perianth tube 3-6(-8) cm long: segments 2-4.5 cm long,
0.7-1.5 cm wide, elliptical, obovate or oblanceolate, acute or obtuse.

Filaments 5-8 mm long, usually pale yellow, glabrous or finely pubescent
at the base: anthers 9-13 mm long, yellow. Style divided at a variable
point, usually ranging from just below or level with the base of the
anthers to about a quarter of the way up the anthers, into 3 bright red
branches, each 0.7-2 cm long, half or less than half the length of the
perianth segments, expanded gradually to the apex."

Maybe Jane can discuss the source of her bulbs.