There are some fashion items that are so rudimentary that I can never remember to buy them, and when I really need them and tell myself to order them, I forget as soon as I see a bright, shiny object to order instead. Know what I mean? In this case, the thing I always forget to buy but always need (this time of year especially) is long-sleeve T-shirts—both solid and striped. The ones I wear the most usually have a crew-neck, and I find that owning a combination of fitted and oversize ones will do you the most service.My observation is that long-sleeve T-shirts often get overshadowed by short-sleeve tees, sweatshirts, and sweaters. But when you need to layer or when you need something that’s not too warm but not too light, your best bet is a long-sleeve tee. In case you need to be reminded just how essential they are to an outfit, I found a whole slew of examples for you. And in case you need to stock up on them, I’m sharing 16 of my current favorites, most of which are under $100. Scroll to be convinced.Style Notes: When shopping for striped tees, go for an oversize one for the most current look.Style Notes: For ballerina vibes, opt for a scoop-neck second-skin tee.Style Notes: When your bottoms are loose, it’s always a good idea to pair them with a slim tee (and vise versa).Style Notes: Shorts and a long-sleeve tee will always be a go-to early fall outfit combo.Style Notes: A cream-colored tee looks especially chic with checked trousers.Style Notes: Striped tees are great with jeans but even better with leather pants.Style Notes: Stock up on close-fitting tees for layering.Style Notes: Just another great example of slim on the bottom, loose on top.Style Notes: Want a tee that’s a bit more dressed up? Get yourself one with shoulder pads.Style Notes: Neutrals are great, but having a couple of colorful ones on hand is also recommended.Style Notes: Never underestimate the power of a cool neckline.This heavyweight tee looks and feels much more expensive than it is.This is so elegant.This cool-girl brand is a favorite of celebrities for a reason.Everlane will always be an amazing source for excellent affordable tees.Sometimes the basic is also the standout piece.This perfect little tee is a Reformation classic, and it comes in so many good colors.This one is so soft IRL.Skims fitted tees are cult favorites for a reason.No tucking in required.This ultra-soft tee is one you’ll want to buy in bulk.Don’t sleep on Lululemon tees (but feel free to sleep in them).This looks so comfortable.You can never go wrong with a Leset tee.It’s wise to have super-fitted tees on hand for layering purposes.Another fitted tee that people love.A great addition to any winter wardrobe.This cozy, casual tee is 50% off right now.Madewell’s Whisper tees are the stuff of legends.Everything Alo makes is soft and cool, including this tee.Next up, five everyday shoes you’ll regret not buying, according to a personal stylist.This story was published at an earlier date and has since been updated.