Camisoles and UndershirtsCamisoles are an important part of a Lolita's underwear drawer because they're handy for wearing under chiffon blouses that you might want to pair with a skirt, or for layering under blouses that are only slightly too sheer. While cute and lacy camisoles are perfect to have, you might want to consider adding a couple very plain, breathable, undershirts as well to this collection, for when you simply need an opaque layer under your clothes. While frills and bows may be tempting for this layer, try to avoid any unnecessary decorations that might show through in an obvious way under a blouse.
A well-rounded Lolita wardrobe is going to at least 1 camisole in a matching color for every sheer or semi-sheer blouses you might have, as well as a couple plainer undershirt in at least a neutral color close to your skintone and whatever base colors your wardrobe has (black, white, or offwhite generally). Generally, you're going to want to have enough camisoles and undershirts to be able to wear a fresh one every time you wear Lolita.
Corsets or ShapewearCorsets are not exactly a vital item that every Lolita must have, but they're definitely something you might want to consider if you wear Lolita on a regular basis, especially a more Classic or Gothic style. Corsets are a good item for slimming down the extra bulk all the layers of Lolita might add to your silhouette, making sure you can fit into that last half an inch of a particular skirt, and for layering over coordinates for an extra luxurious look. One of the first entries I ever wrote on this blog was about how great I think corsets are in a Lolita wardrobe and features some advice (that is still relevant!) for any Lolita looking to add one to their wardrobe. You can check that post out here!
A Lolita wardrobe could easily benefit from having two different corsets, a plain one you can wear under clothes, and a fancier one you can layer on top of your clothes. If you're not really looking to spend a lot on a corset, but are still interested in smoothing out your silhouette, there are a lot of shapewear out there, that even has the added benefit of looking cute and lacy, that you can pick up for a relatively cheap price.
Socks and TightsDoes anyone get more excited to receive socks as a gift than a Lolita? While socks and tights are such a major feature of the Lolita fashion that it's hard to designate them to the underwear drawer (myself, like many Lolitas, actually have a whole drawer dedicated to just socks and tights!) I feel as if I should cover them in this post anyways. First of all, any Lolita is probably going to have an assortment of knee highs and over-the-knees and tights that they like to match with their favorite dresses, and this is fantastic, seriously, you should have as many of those as you can get your hands on, but what about the less exciting legwear? As easy as it is to overlook, you should probably have a good amount of "boring" legwear to go with your Lolita wardrobe, and honestly, most of you are probably going to have these things as part of your non-Lolita wardrobe, but they make a very useful crossover into your Lolita wardrobe as well.
One of the more important types of boring sock a Lolita can add to their closet is a few very basic pairs of low-cut or "invisible" socks. Ideally, you should have a few pairs of these in whatever base color your socks are! They're perfect for wearing over your more expensive Lolita socks to help keep them from getting dingy or from getting holes worn in them. If you're wearing a shoe that doesn't allow you to hide an extra sock, you can always wear them under your fancy Lolita socks for some added cushioning and protection against wearing holes in them.
Plain colored opaque tights, particular in either black, white, or cream, are also a great basic addition to a Lolita's underwear drawer. Besides making an easy addition to pretty much any coordinate, they're also useful for layering under something like lace tights or sheer tights in the cooler months.
PetticoatsA petticoat is often considered the most important part of a Lolita's underwear drawer, and it's undeniable that they're a very important part of the Lolita aesthetic. Depending on your own Lolita style, different types of petticoats might be more suited for your wardrobe. If you tend to wear styles that have a lot of poof then a mega-fluffy chiffon petticoat might be your best bet, if you have a lot of tea length skirts an appropriately long petticoat would be required, etc.
Generally the most well-rounded Lolita wardrobe is going to have a number of different petticoats to choose from, or to layer as needed. If you're just starting a Lolita wardrobe a puffier petticoat and a more toned down petticoat, both in neutral colors that compliment your wardrobe, are good additions to your wardrobe. If you're curious what sort of minimal hassle petticoat I would suggest, check out this post!
BloomersBloomers are sometimes considered a non-necessity for a Lolita wardrobe, but personally I think they're a very important part of a Lolita wardrobe. Their most important purpose is to prevent any up-skirt flashes that are all-too common when you're wearing a relatively short and poofy skirt. In addition to preserving your modesty, bloomers also provide warmth in the winter and an extra bit of cuteness and lace to outfit year-round.
A full Lolita wardrobe is going to have enough pairs of bloomers to wear every time you wear Lolita. Ideally they should be in a color that compliments your outfit, but as they're generally not meant to be seen (although they do end up showing most of the time anyways!) you can get away with pretty much any neutral colored pair of bloomers. Bloomers are relatively easy to make yourself if you need to add a significant number to your wardrobe, check out the tutorial section to find some bloomer how-tos!
In a pinch, or in hot weather, shorts in a breathable material are a good substitute.
UnderskirtsAn underskirt in the perfect length is another item, like the corset, that's not exactly necessary but is a good idea anyways. An underskirt's main thing is to add is a few extra inches to any skirt that might be slightly too short. They also can help even out any lumps and bumps in a petticoat or provide a solid base under a thin and slightly-sheer skirt so your petticoat's color doesn't show through.
Ideally a Lolita wardrobe should have a couple underskirts in complimentary or neutral colors so they don't look out of place peeking out under skirts.
These are the types of clothes that I consider to be foundation pieces in any well developed Lolita wardrobe, things that you can literally build great Lolita coordinates upon! Of course though, everyone wears Lolita in their own unique way and some people might have different types of foundation garments in their wardrobe. What sort of things do you consider necessary Lolita undergarments? What sort of pieces would you consider optional and which would you consider the most important?