So I've noticed my shoes feeling a lot smaller recently, is this something that happens a little just when starting out or have you guys found a large increase in foot size? I don't really want to buy new shoes and then another pair like three months later.

Fat redistribution can occur in the feet. It's likely not a genuine size increase unless you're still growing.

Hi jagfel! Presuming you're FtM and "just started" (when?) testosterone... Testosterone is an anabolic hormone. It will cause some nitrogen, sodium and water retention. That's why some people may have water retention (edema) during the first few weeks of TRT which can be reflected as increased weight or ankle and foot swelling. That may be an explanation for the feeling of smaller shoes that you mention. Try to sleep with your legs raised (couple of pillows under the bottom of your mattress) and see if in the morning the shoes feel "bigger" again - that would be a clue to fluid retention. Anyways, there are other possible explanations, so if it's of concern to you, do not hesitate to consult your physician.
Hugs, Sarah

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It affects the amount of cartilage regeneration between bones as well.

I was a shoe size 5.5 up till about 3 years ago. Now I can wear size 7s comfortably and can't even get in to my 5.5s. Absolutely no idea why because I only started T 3 months ago so couldn't have been water retention or anything to do with T. (The weird thing is it began to happen around the time I accepted decision to transition)

Have noticed my gloves feeling small and there's no apparent water retention in my body or hands. I guess there's probably some, it's just not visible. Either that or T is thickening cartilage between hand/feet bones as I read about recently, and it's also supposed to increase collagen production in the body (according to studies), or it's something to do with fat distribution.

Neither my hands nor feet have increased in length, but they definitely feel 'meatier'. I was far beyond my first bout with puberty (28) when I started, so there were no disillusions on my part of any bone lengthening occurring.
I still wear a men's size 9 but it feels a lot more snug than it did before. My feet were fairly thin pre-T, so even though the length matched the shoe size, it felt like my foot never really 'filled' the shoe. I always had to lace them pretty tightly. Now I intentionally lace them loosely if at all because it feels like my feet are being strangled otherwise.
It's not water retention--no weird puffiness--as they're very solid.

I'm not on T but my feet have gotten longer as I've gotten older. So have my aunt's and one of my friend's. Some people's feet spread wider and others spread longer.
I usually wear a men's 9 now but even 5-6 years ago I could fit in 8-8.5 (all mens sizes and same brands).

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I'm about to hit 2 months on T but my feet don't really feel like there's any water retention affecting them. I'm almost 24 so I don't think it's a late growth spurt but not close enough with any of my immediate family to ask if they've had similar changes at this age.

I'm personally not too concerned with whether I have any more growth in them or not but shoes are going to get pretty expensive if it keeps happening.

Yeah, I've already got 3 new pairs that don't fit

I wonder if it's just age.

My feet measure the same size as pre T but as said already they are beefier. So I've gone up at least a half a size for comfort. For dress shoes that are narrow at the tip sometimes a whole size. Like a wingtip for instance. Or an Oxford.