No, that‘s not really a thing, and cycling clothes cannot be altered the way usual shirts can be altered. In many places, they use laser welding (not sure whether this is the proper term in English) and the like to affix two pieces of cloth (plastic) to one another.
Cycling clothing has to fit properly when you buy it. Just like with other clothing, some manufacturers have different fits, so especially with tight-fitting clothes (“race fit”) you need to look at the measurement charts and verify that they actually do fit you. Hence, my comment that Asian fit cycling clothes is likely not a good fit for non-Asians. By the way, the same is true for glasses, some manufacturers have Asian fit frames (as well as they should!), so be aware of that when you buy.
don't bother, just 1) put up with a little extra length 2) buy shorter and use the glove cuff to cover exposed areas 3) buy the correct length. On the bike you don't lift your arms over your shoulder height, so lifting your arms up to check length has no relevance to cyclewear. Cycle sleeves will be shorter than your regular wardrobe.
Guessing here, but a fairly simple alteration like sleeve length is probably going to depend on the material. Some of the hi-tech lycra type materials may be laser cut and come out badly if cut with scissors. In terms of pure skill though, Japanese alteration services will be very good. If you know someone really good, it can be better to buy a cheap dress shirt from say Uniqlo and get it (radically) altered than to buy a 10,000 to 15,000 shirt off the peg. I think it was on NHK World, but I've seen examples of people doing this.
As Simon says, dedicated cycling gear is supposed to fit in riding position. "Snug" in riding position may be uncomfortably tight when off the bike, etc.
I see, the problem I had was that for the S size it fits my body well with a little more allowance but the sleeves can cover up to my finger tips. As for XS the fit was body tight without allowance with a base layer but the sleeve is much more bearable. I'm just afraid in the case that I gain a little weight and the XS will be out completely.
Both feel great in riding position though the sleeve on the S is so long it can flap (And the cloth around chest and stomach part with raise up)
It is this exact jersey:
Looking at the material, there is wind block and insulating material stitched to the front part of the body and arm which is why I'm not very sure can the local alteration do it. (Even though I googled and seems like some cyclist just alter it normally)
Material wise I'm not sure how do Rapha weld them together:
- 89% merino wool
- 11% nylon
One more thing: in your situation I strongly advise against buying shoes online — unless you know your exact fit and size. Some shoe manufacturers have a narrower fit than others, some shoes are more or less rigid than others.
Will definitely try and buy it in person! Thank you for the advice!