I restarted. So far I've tried with new addition to the house. Tried with my default house. Tried corrupting her first at her camp before imprisoning her. Tried setting up the camp first before recruiting her. Everytime I go to my workbench in my house in arenfield there is nothing about clothes or armor for her. Lol I'm not sure what I'm missing but if I can ever figure this out I'm sure I'm going to feel stupid
Did you put wine at camp fire and have a party? Talked to Imawyn next day when she sits at camp fire and ask about the Party?
Thing is, depending on progress status with other quests, she would want 2 different sets of clothes, early on you'll need to break in to the Barons house and on 2nd floor if I recall correctly, are rooms to north and south with closets and dresses, one for Lyvia to attend party, one for Imawyn.
If you'r too far along in some missions, can't recall which but think it's actually Imawyns new armor, the dress for Imawyn won't get picked up so you can only steal the one for Lyvia.
It's also up here you get the dress for Liandra if you have her at Camp and not turned her in to the Baron.
In either case, if you got the dress for Lyvia have had a party, the talk with Imawyn at camp fire should start the quest to get her new clothes/armor.
This would be seen in your workbench at MC house in the normal item area, not armor.. though it is an armor and it needs Spider Silk!
If you see it as craftable, head to the swamp north of the Witch hut, hunt spiders, might wanna save before a battle because the drop is random. If you have Bianca in team (completed her and Gavina's quest lines) you can use her PickPocket battle skill to steal from a spider, success would get 1 spidersilk and still a chance it would drop 1 at death, lessening the grind a bit.
If you don't have Bianca it's just more battles to grind, remember save before it starts so you can redo it if silk doesn't drop.
Spiders have 4 drop options: Ring, Silk, Ring & Silk or Nothing at all.
When you got enough resources, head to MC house, craftbench, make all Imawyns armor pieces, head back to camp and talk with her at the fire to give the clothes.
It's also connected to the Drum quest with Tia, so if your not far ahead with that yet, it might be why it doesn't pop?