Looks like Black Rubber Tights M || ラバータイツM 黒.
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This outfit was pretty much made for Katarin.
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Combat Rider is very nice
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This scratch is very, very good.
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I just realized as I was about to begin this post, I only got stuff for my CASTs on this scratch so far, and none of it actual CAST parts.
Finnian: Finally got Sharp Order Shadow [Ba], so here he is with Zodiac Camo Chestnut [Ou] and Tactical Vest [Ou] (also, no Beast face since it didn't look right with the headset).
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Rhian: Finally got Apprentice Hair for her (still need to get a second one though -_-; ), and the Stella Memories Snow [Ba] today was a pleasant surprise.
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Erin: I haven't really gotten much for her as of late, but I did like how Combat Rider [Ba] looked on her, though I couldn't get the black inner (which I think looks much better) due to my current lack of funds after affix boost week (though hopefully the prices come down a bit more since this scratch will be around for 8 weeks).
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EDIT: Took a bit more time and made a slightly different look for Erin in the Combat Rider Crimson [Ba]:
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If you know what パンク is then oh boy this is going to be fun!
Before you see first funny image, please know in advance that I have zero intention to offend or judge others of their fashion. Thank you.
Also note I only play in Ship 4, something to add I guess.
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Buying Effector hair seems to be the final touchto go with the Lindwurmb "set"Spoiler!
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Valyn, your character is absolutely a breath of fresh air. (That is a good thing.)