I’m looking for maternity clothes for teenage boys,where can I find them? I’ve already looked In some sites, but I only find girl's clothes!

Leto has a couple
Example:
https://letomills.tumblr.com/post/7...wnload-sfs-mega

Thank you so much

Finally, the time for my own niche knowledge of this subject to become relevant!

Over on the InSim forums, you will find For the Boys - Sci-Fi T-Shirts [New Mesh] and Recolors of Existing InTeen Meshes for the Boys by AdmiralAries.

On GoS from Serenity Falls/rented-space, a 3t2 conversion of the Luxe Loungewear at 2015.3 - All Men! (That one I believe doesn't need anything else beyond what's on the post if memory serves. If it does, let me know because I just did some downloads reorganizing so I should have a good sense of what I need to track down.) There's also the 3t2 conversions of the Loose shirt that you can find on their Tumblr (click to go direct to post). (If you're looking for the AM version should that interest you, head to this post of theirs instead!

Several from withlovefromsimtown on Tumblr, including:

• Default Replacements (Some are just mesh replacements to add morphs, others have TM add-ons, but others are a full set of defaults so be sure to consult the full post before downloading!): BG Hoodie Replacement | H&M Polos | BG "Gothic" Outfit Replacement | BG Flares Outfit Replacement | BG Hoodie with Board Shorts Replacement | BG Overhang Shirt Replacement | NL Greaser Outfit Replacement | BG Briefs Replacement | BG Pajamaboxers Replacement | BG and Uni Shorts Replacement | BG and Uni Pajamadrawstring Replacement
• Androgyny Sets (depending on your preference for any body type alternations): Androgyny - Underwear/Pajamas | Androgyny - Swimtrunks | Androgyny - Sporty | Androgyny - Slip (PJs and Swimwear)
• Custom Creations: Cargo Pants Outfit
• I just went with what I use, but on their blog in the downloads tag you can find more! As mentioned earlier, just be mindful of the download's text.

Through my own discovery, unless the downloads themselves have changed, letthemplaysims/Queen of France's Let 'Em Know! (MTS) and Striped Tee for CU-EU (Tumblr) had the morphs. If you have CC that allows for separates in different categories (such as allowing for tops and bottoms in pajamas and gym clothes instead of full body), these can pair well with those categories! The only crunchy bit is that with a lack of bottoms that have the morphs you'll have some overhang from the top (even in the everyday category), but if that's not a complete dealbreaker then it should be just fine.

Lastly, a few from Jawusa right here on MTS: A Set of Age Conversions for the Older Nerds, Jocks and Rebels - With a Tiny Twist | EA's Mid-Century 50s Diner-ish Outfits Converted for Other Ages

Hopefully this helps a bit! I know trying to track all of these down over the years has taken a lot of effort, so I do hope this will fill out your sims' wardrobe.