From the similarly named subreddit:
Shoes:
Canada West (MB) https://www.canadawestboots.com/
Tatra (ON) https://www.tatra.ca/ (work boots)
La Canadienne (QC) https://lacanadienneshoes.com/
Wohlford (BC) https://www.wohlford.ca/ (work boots)
Viberg (BC) https://viberg.ca/ ($$$$)
Padraig Cottage (BC) https://www.padraigcottage.com/ (baby slippers)
Martino (QC) https://www.boutiquemartino.com/en (boots)
Clothing:
Anian (BC) https://anianmfg.com/
Canadian Wolf (QC) https://www.canadianwolf.com/
Province of Canada (ON) https://provinceofcanada.com/ (size runs a bit big)
Little and Lively (BC) https://www.littleandlively.com/ (kids)
Victoire Boutique (ON) https://victoireboutique.com/
Naked and Famous Jeans (?) https://www.nakedandfamousdenim.com/
Polar Piece (ON/ BC) https://www.polarpiece.com/
North Standard (ON) https://northstandard.com/
Simply Merino (BC) https://www.simplymerino.ca/
Jerico (ON) https://jerico.ca/
Good for Sunday (ON) https://goodforsunday.com/
Stanfields (NS) https://www.stanfields.com/
Blondie Apparel (ON) https://blondieapparel.com/
Rowe (BC) https://wearerowe.ca/
Happiness Is Inc (ON) https://happinessisinc.com/
Ecologyst (BC) https://ecologyst.com/
This is J (ON) https://thisisj.com/ (bamboo PJs)
Local Laundry (AB) https://locallaundry.ca/
House of Blanks (ON) https://www.houseofblanks.com/
Blankets/ Socks/ Hats:
MacAuslands (PEI) https://www.macauslandswoollenmills.com/index.php
Topsy Farms (ON) https://www.topsyfarms.com/
JB Fields (ON) https://www.jbfields.ca/
Thermohair (ON) https://www.thermohair.com/
Custom Woolen (AB) https://www.customwoolenmills.com/
Dream Power Costume (ON) www.dreampowercostumes.com (bath hoodie)
Leave Your Hat On (hats) (NS) https://www.leaveyourhaton.com/
The Hat Junkie (NS) https://www.hatjunkie.com/
Leather Goods/ Accessories
Popov Leather (BC) https://www.popovleather.com/
Populess Leather (AB) https://www.populess.com/
Mariclaro (ON) https://www.mariclaro.ca/
Phee's original goods (NS) https://pheesoriginalgoods.ca/
Small Hours (ON) https://smallhours.ca/
Crafted Gambit Goods (AB) https://www.craftedgambitgoods.com/
Fab Hand Crafted (QC) https://www.fabhandcrafted.com/ (specialize in camera straps)
Food/ Cooking:
Three Farmers (SK) https://threefarmers.ca/ (Camelina Oil)
Thomas Haas (BC) https://www.thomashaas.com/ (Chocolatier)
Arbol Cuisine (QC) https://arbolcuisine.com/ (Cutting Board)
Meyer (PEI) https://meyercanada.ca/collections/meyer (Cookware)
Heartbeat Hot sauce Co (ON) https://www.heartbeathotsauce.com/ (Hot sauce)
Maritime Madness (PE) https://maritimemadness.com/ (Hot sauce)
La Pimenterie (QC) https://lapimenterie.com/en/montreals-finest-hot-sauces/ (hot sauce)
Appleton Chocolates (NS) https://www.appletonchocolates.ca/
Natural Wellness:
Saje (BC) https://www.saje.ca/
Attitude (QC) https://ca.attitudeliving.com/
Glowing Orchid (BC) https://glowingorchid.com/
Rocky Mountain Soap (AB) https://www.rockymountainsoap.com/
Salt Spring Soap Works (BC) https://www.saltspringsoapworks.com/
Earth Elementals Soap (NS) https://earthelementals.ca/
Birch Babe (ON) https://birchbabe.com/
Warm Buddy (ON) https://www.warmbuddy.com/
Cool Nukes Bowl Cozies (NS) https://coolhandnukes.com/
Jewelry:
Forestial Friends (BC) https://www.etsy.com/ca/shop/ForestialFriends
Proud Wednesday (AB) https://proudwednesday.com/
Leah Alexandra (BC) https://leahalexandra.com/
Strut (ON) https://www.strutjewelry.com/
Eidel Precious (ON) https://www.etsy.com/ca/shop/EidelPrecious
Twenty Compass (QC) https://twentycompass.com/
Furniture:
Go Coconut (QC) https://gococonut.ca/
Off Your Rocker (ON) https://offyourrocker.ca/
Craft/ Stationary/ Candles/ Puzzles
Hemlock & Oak (BC) https://www.hemlockandoak.com/
Pietersmatin Works (ON) https://www.pietersmatinworks.com/
Little May Papery (AB) https://littlemaypapery.com/
Cordova Candle (BC) https://cordovacandleco.com/
Honey Candles (BC) https://www.honeycandles.com/
Stumpcraft (AB) https://www.stumpcraft.com/
Milk Jar Candle (AB) https://milkjar.ca/
Crowfoot Candle (BC) https://www.crowfootcollective.com/
Flaunt Cards (BC) https://www.flauntshop.com/
Other:
Wildflower Seed Bombs (?) https://wildflowerseedbombs.ca/
Scam Skate (MB) https://scamskate.com/
Salt Spring Seeds (BC) https://www.saltspringseeds.com/
Heritage Harvest Seeds (MB) https://heritageharvestseed.com/
Annapolis Seeds (NS) https://annapolisseeds.com/
Revival Seeds (NS) https://revivalseeds.ca/
Greta's Family Gardens (QC) https://www.seeds-organic.com/