atually i can clarify for you,
A rebbitzin who actually started a worldwide tniyus program told a few girls(me included) that there is NOTHING wrong with the lycra shells. they can b as tight as you want, your elbows are covered so there is no issue.
just like any style at first if it gives a ‘look’, you shouldnt be the first to wear it, however once it gets excepted in the community, there is no problem.
these include: belts(which show the figure of a woman), peep-toe shoes, pencil skirts, long sweaters, the POSH/BOB( which btw if you ladies would know where the style came from you’d rip the sheitel off you head) and the list is endless.
again once its accepted in the community there is NO problem!