I misunderstood your inquiry, I think 🤦♀️ You could use plastic embroidery canvas like this and superglue it from the underside, I bet if you cut it well it would look alright.
Crochet by its nature is stretchy so I feel like you’d definitely need boning or structure to keep it in place or get the shape you wanted.
I haven’t tried a corset, but these awesome folks on this sub helped me figure out some plastic additions to a huge oversized hat I was asked to make in order to keep it from being totally floppy. That stuff really helped and is here:
4-Pack of Darice Mesh Plastic... https://www.amazon.com/dp/B073WJYWTC?ref=ppx_pop_mob_ap_share
Not sure if this will work with pearlweed but I have glued moss to rocks to contain it. I have also read about using needlepoint mesh to create mats
4-Pack of Darice Mesh Plastic Canvas - Clear - 10.5 x 13.5 https://www.amazon.com/dp/B073WJYWTC/ref=cm_sw_r_cp_api_glt_fabc_2AF2C6QAH2F3KB5625N9?_encoding=UTF8&psc=1 I just cut these up!!
I had to google.. they are officially called "plastic canvas sheets" - you should be able to get one for about $1-$2 at any craft store such as JoAnn Fabrics, Michaels, Hobby Lobby (maybe even walmart) - a linky for amazon so you can see what I'm talking about https://www.amazon.com/4-Pack-Darice-Mesh-Plastic-Canvas/dp/B073WJYWTC/ref=sr_1_5?keywords=plastic+canvas+sheets&qid=1669618418&sr=8-5
Jobelan is pretty common, it's on Amazon, Etsy, and almost any stitching site. I love the ladies at Stoney Creek and you get a free pattern of the month when you order from them, so here's the link to the Jobelan there:
https://store.stoneycreek.com/mobile/jobelan-c98.aspx
I found I don't really like stitching on wood, even though I love the wooden cross stitch blanks that are out. Search Etsy for "wooden cross stitch blanks" to get all different shapes and sizes. I've bought this one because she has great patterns to go with them:
https://www.etsy.com/listing/1017199321/stamp-cross-stitch-cross-stitch-blank
The stitchable "leather" cuffs I found at my local Joann store. https://www.dmc.com/us/p-free-diy-projectsjewelrystitchable-faux-leather-cuffs.html I couldn't find them online at joann.com, but this shop at Etsy has them: https://www.etsy.com/listing/749186521/cross-stitch-stitchable-cuff-bracelet
Joann still has stitchable cork available: https://www.joann.com/dmc-10x10-regular-stitchable-cork-fabric/15368731.html
Plastic canvas is available at most craft stores. Usually you use yarn to stitch on it, not floss. https://www.amazon.com/dp/B073WJYWTC/ref=cm_sw_r_cp_apan_glt_fabc_CBSE24TDR1NWCNHK1KRV
Perforated paper is also available at amazon, on Etsy, and in many needlework stores. Mill Hill is the most common brand if your searches aren't coming up with good results.
https://store.stoneycreek.com/mobile/perforated-paper-c229.aspx
HAHA I'VE FOUND IT!! https://www.amazon.com/4-Pack-Darice-Mesh-Plastic-Canvas/dp/B073WJYWTC/ref=sr_1_2?crid=1PREHE8QSKTSB&keywords=plastic+mesh+canvas&qid=1638765554&sprefix=plastic+mesh%2Caps%2C203&sr=8-2 This is the plastic canvas mesh thingy I was talking about. This is what I used to give it support.
I got it on Amazon, it’s called craft mesh I think!! 4-Pack of Darice Mesh Plastic Canvas - Clear - 10.5 x 13.5 https://www.amazon.com/dp/B073WJYWTC/ref=cm_sw_r_cp_api_glt_fabc_2AF2C6QAH2F3KB5625N9?_encoding=UTF8&psc=1
I used a mesh from amazon. https://www.amazon.com/gp/product/B073WJYWTC/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1
Tbh you could probably cut some cheap, clear plastic that fruit, salad mixes, "quick meals" from stores come in.