Anon for this:
The gemara already dealt with this question. The gemara brings how one of her sons Yishmael was tamei two different times and each time a different brother had to take over for him. Tosefos Yeshanim brings that its likely that this happened other times as well and in this way each of her sons spent some time as the kohein gadol.
The Gemara that speaks about getting dressed for one’s husband is in Taanis 23b with Abba Chilkiyah who’s wife would get dressed up to greet him when he came home in order that he shouldn’t look at other women.
I am told that women in Me’ah She’arim have special sheitels that they put on when their husbands come home. So I don’t think that getting dressed for your husband necessitates specifically getting dressed down.
Like philosopher said I think selling non-tzniusdig clothing in a store is akin to selling non-kosher and kol yisrael areivim zeh la zeh.
I think a better way to sell lingerie would be to sell it in private to people that need it since it is something that is used in private. There are many other things that we deal with privately when it is connected to private issues.