Hi @Floria7 , yes, since you are using a reflexive verb (godersi) the past participle must agree with the subject gender and number.
The rules for the concordance are not simple. A rule of thumb - but there are exceptions - is that if the auxiliary verb is “essere”, there must be concordance with the subject. If the auxiliary verb is “avere”, generally the participle remains invariable.
Also, sometimes the participles agrees with the object instead of the subject.
“Hai fatto cena?” - “Sì, l’ho fatta”. Here the participle agrees with the object (“la ho fatta, la cena”).
You can check point 3 in the following page if you want more details:
Più tardi! This is fantastic @David755502! Simona is now a big favourite, what a great teacher, con i denti da morire;-) Together with Vaporetto she’s definitely top of la lista and I love the way she explains it so simply. No wonder my friend in Lucca kept rolling with laughter every time I used it.