I almost always wear little clips in my hair. They're relatively inexpensive (I got mine from Claire's) and they can be as simple or as intricate that you want them to be! I have a set of glitter and a set of pastel clips -- I wear them all of the time and always get compliments on them, people think they're cute! If you don't like wearing clips in your hair, you can wear a cute bag too. I have a couple that I wear, two of which are backpacks, which I think are much more versatile than purses. One is a pastel purple and pink backpack that carries my usual supplies for my classes, when I have classes. Another is a Betsy Johnson cross-body purse that's pastel pink and black with cute bows on it. I've gotten compliments on both and they both make me feel super cute and little! If you want something even more inconspicuous I also like to wear a plain pastel jacket or sweater with my outfits. It's super easy to find too (I got mine from Walmart!). It's really about being creative. You can get plain things in your favorite colors and then put pins on them if you want. Maybe put a safety pin, which is little and inconspicuous, it could represent your little self especially if you wear diapers (safety pins are often associated with diapers and babies). You could use anything that makes you feel little or reminds you of being little, as long as you know what it means, that's all that matters!