It depends! In Underwood!AU he wears either Alec's buttons ups to bed or Bertrand's (dead uncle). Unfortunately Alec is extremely abnormal about Ivett doing either of these. After meeting István in any AU though he starts wearing his band merch a lot, especially to bed. He likes the smell of his bf's sweat and blood, but he rotates what he wears still in Underwood !AU

(Underwoods belong to @/macthedke)