I haven't seen the rules for clothing at the time, if there were any, but I don't think the ISU forced the early women competitors to wear elegant dresses.
The women wore dresses or skirts and blouses when skating because that's what women wore.
https://en.wikipedia.org/wiki/Madge_Syers
https://en.wikipedia.org/wiki/Lily_Kronberger
https://en.wikipedia.org/wiki/Herma_Szabo
https://en.wikipedia.org/wiki/Maribel_Vinson
Some of them chose to emphasize elegance in the clothing they chose; others went for more sporty looks within the parameters of female attire at the time.
I think that Sonja daughter of furrier Henie and her competitors did a lot to popularize glamour in costuming as they tried to outdo each other in that area, and similarly in later generations. But that impulse came from the skaters themselves, not from the rules.
I'd have to do more research to learn whether the rules explicitly required skirts before the 1988 "Katarina rule." I've seen images of female skaters competing school figures in trousers (and even I think shorts + tights) in the mid-20th century.
The women wore dresses or skirts and blouses when skating because that's what women wore.
https://en.wikipedia.org/wiki/Madge_Syers
https://en.wikipedia.org/wiki/Lily_Kronberger
https://en.wikipedia.org/wiki/Herma_Szabo
https://en.wikipedia.org/wiki/Maribel_Vinson
Some of them chose to emphasize elegance in the clothing they chose; others went for more sporty looks within the parameters of female attire at the time.
I think that Sonja daughter of furrier Henie and her competitors did a lot to popularize glamour in costuming as they tried to outdo each other in that area, and similarly in later generations. But that impulse came from the skaters themselves, not from the rules.
I'd have to do more research to learn whether the rules explicitly required skirts before the 1988 "Katarina rule." I've seen images of female skaters competing school figures in trousers (and even I think shorts + tights) in the mid-20th century.