If it's done privately, then what you do is entirely up to you.
For me, personally, if I'm in my own home, I wear whatever I want. Sometimes a skirt is more comfy to lounge around in than pants. Sometimes a t-shirt dress is the best option when I'm doing laundry and washing everything else. Sometimes I just want to wear something in particular, so I do. Sometimes I see a nice outfit, and want to wear something like it. Sometimes I'll wear something special or unique or w/e, just to have fun.
For me, personally, sometimes it's not sexual, and sometimes it is. I am a sexual person, and sometimes the two aspects - crossdressing, and having sexual feelings - will intersect. There's nothing wrong with any of that either, imo. It's my house, I can do what I want.
Either way, if you're in your own home, you too can do what you want. If you're looking for any specific advice, I can try to offer some - but without more details, I have no idea what kind of advice you're looking for. Sizing? Style? Colors? Inspiration? General inquiries?